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1 Chapter 1 : The FileSystemWatcher example in Visual Basic After you master the basics of programming Windows applications with Visual Basic and you feel comfortable with the more advanced examples of this tutorial, you will find it easy to catch up with the topics not discussed in this tutorial. The WordFrequencies application scans text files and counts the occurrences of each word in the text download the project here. To retrieve or update the frequency of the word elaborate, for example, you will use this expression: Value where Words is a properly initialized HashTable object. When the code runs into another instance of the word elaborate, it simply increases the matching item of the Words HashTable by one: You could also use the SortedList collection described later in this chapter, but this collection maintains its items sorted at all times. If you need this functionality as well, you can modify the application accordingly. Let me start with a few remarks. First, all words we locate in the various text files will be converted to uppercase. Because the keys of the HashTable are case-sensitive, converting them to uppercase eliminates the usual problem of case-sensitivity hello being a different word than Hello and HELLO by eliminating multiple possible spellings for the same word. Instead, each value in the HashTable is the number of occurrences of a specific word. To calculate the actual frequency of the same word, we must divide this value by the number of occurrences of all words, but this can happen only after we have scanned the entire text file and counted the occurrences of each word. To scan a text file and process its words, click the Read Text File button. The Open dialog box will prompt you to select the text file to be processed, and the application will display in a message box the number of unique words read from the file. Then you can click the ShowWord Count button to count the number of occurrences of each word in the text. The last button on the form calculates the frequency of each word and sorts the words according to their frequencies. The application maintains a single HashTable collection, the Words collection, and it updates this collection rather than counting word occurrences from scratch for each file you open. The Frequency Table menu contains the commands to save the words and their counts to a disk file and read the same data from the file. Use these commands to store the data generated in a single session, load the data in a later session, and process more files. To test the example I used a set of text files from my computer. The code reads the text into a string variable and then it calls the Split method of the String class to split the text into individual words. The Split method uses the space, comma, period, quotation mark, exclamation mark, colon, semicolon, and new-line characters as delimiters. This function returns False if one of the characters in the word is not a letter; strings such as B2B or U2 are not considered proper words. IsValidWord is a custom function, and you can edit it as you wish. Any valid word becomes a key to the WordFrequencies HashTable. The corresponding value is the number of occurrences of the specific word in the text. If a key a new word is added to the table, its value is set to 1. If the key exists already, its value is increased by 1 via the following If statement: Page 1

2 Chapter 2 : Official Visual Studio blog.quintoapp.com Samples in blog.quintoapp.com The WordFrequencies Example in Visual Basic In this section, you'll develop an application that counts word frequencies in a text. The WordFrequencies application scans text files and counts the occurrences of each word in the text (download the project here). NET, one of the most latest and mature version yet of the most popular programming language for building Windows and web applications. In modern software development, however, the language is only one of the components we use to build applications. The most important component is the. You can think of the Framework as an enormous collection of functions for just about any programming task. All drawing methods, for example, are part of the System. To draw a rectangle, you call the DrawRectangle method of the System. Drawing class, passing the appropriate arguments. To create a new folder, you call the CreateDirectory method of the Directory class, and to retrieve the files in a folder you call the GetFiles method of the same class. The Framework contains all the functionality of the operating system and makes it available to your application through methods. The software development process relies on numerous tools that streamline the coding experience, and these tools are provided for us by Visual Studio The third component is an integrated environment that hosts a number of tools enabling you to perform many common tasks with point-and-click operations. This environment, provided by Visual Studio, is known as an integrated development environment, or IDE. You can use similar tools in the same environment to design a fancy data-driven web page without a single line of code. Visual Studio even provides tools for manipulating databases and allows you to switch between tasks, all in the same, streamlined environment. Even so, Visual Studio provides numerous tools, from debugging tools to help you track and fix all kinds of bugs in your code, to database manipulation tools. This tutorial shows you how to use Visual Studio and Visual Basic to design rich Windows and web applications. A Windows application consists of a visual interface and code behind the elements of the interface. The code handles the user actions on the visual interface, such as the click of a button, the selection of a menu item, and so on. A substantial segment of this tutorial deals with the most useful components of the Framework. You need to know the meaning of variables and functions and how an If. This tutorial is aimed at the typical programmer who wants to get the most out of Visual Basic. It covers the topics I felt are of use to most VB programmers, and it does so in depth. Visual Basic and the. To make room for more topics, I have avoided including a lot of reference material and lengthy listings. The topics covered in this tutorial were chosen to provide a solid understanding of the principles and techniques for developing applications with Visual Basic. I chose the topics I felt every programmer should learn in order to master the language. I was also motivated by my desire to present useful, practical examples. You will not find all topics equally interesting or important. Many tutorials offer their readers long, numbered sequences of steps to accomplish a task. And the way to creatively exploit the power of a language such as Visual Basic is to understand its principles and its programming model. In many cases, I provide a detailed, step-by-step procedure that will help you accomplish a task, such as designing a menu, for example. But not all tasks are as simple as designing menus. I explain why things must be done in a certain way, and I present alternatives and try to connect new topics to those explained earlier in the tutorial. In several chapters, I expand on applications developed in earlier chapters. Associating new knowledge with something you have mastered already provides positive feedback and a deeper understanding of the language. After you master the basics of programming Windows applications with Visual Basic and you feel comfortable with the more advanced examples of this tutorial, you will find it easy to catch up with the topics not discussed in this tutorial. Of course, you will find information about the latest data access techniques, as well as an introduction to LINQ Language Integrated Query, which is the hottest new component of the Framework. Each chapter is independent of the others, although all chapters contain references to other chapters. As a result, you may find the introductory sections of a chapter too simple. The topics become progressively more advanced, and even experienced programmers will find some new information in most chapters. Even if you are familiar with the topics in a chapter, take a look at the examples. I have tried to simplify many of the advanced topics and demonstrate them with clear, Page 2

3 practical examples. This tutorial tries to teach through examples. The visual basic tutorial starts with the fundamentals of Visual Basic These two objects will also ease the learning process and make it much simpler to learn the features of the language. Then I discuss in detail the basic components of Windows applications. You will find detailed discussions of many Windows controls, as well as how to take advantage of the built-in dialog boxes, such as the Font and Color dialog boxes, in your applications. Visual Basic is a truly object-oriented language, and objects are the recurring theme in every chapter. The three following chapters chapter 10, 11 and 12 contain a formal and more systematic treatment of objects. You will learn how to build custom classes and controls, which will help you understand object-oriented programming a little better. You will also learn about inheritance and will see how easy it is to add custom functionality to existing classes through inheritance. The following few chapters deal with some of the most common classes of the. Then you will find a few chapters on graphics. The first twenty chapters deal with the fundamentals of the language and Windows applications. Following these chapters, you will find an overview of the data-access tools. The emphasis is on the visual tools, and you will learn how to query databases and present data to the user. You will also find information on programming the basic objects of ADO. NET and write simple data-driven Windows applications. In the last few chapters of this tutorial you will learn about web applications, the basics of ASP. NET 2, how to develop data-bound web applications, and how to write web services. Page 3

4 Chapter 3 : The MultipleForms Example - Forms in Visual basic Official Visual Studio blog.quintoapp.com Samples These samples demonstrate many of the new features available with Visual Basic and blog.quintoapp.com Framework including hundreds Language Integrated Query (LINQ) samples. Rather than sending a query to a database to be processed, or working with different query syntax for each type of data that you are searching, LINQ introduces queries as part of the Visual Basic language. It uses a unified syntax regardless of the type of data. You can do all this with common Visual Basic language elements. Because your queries are written in the Visual Basic language, your query results are returned as strongly-typed objects. These objects support IntelliSense, which enables you to write code faster and catch errors in your queries at compile time instead of at run time. LINQ queries can be used as the source of additional queries to refine results. They can also be bound to controls so that users can easily view and modify your query results. For example, the following code example shows a LINQ query that returns a list of customers from a collection and groups them based on their location. For Each country In countries Debug. Count For Each customer In country. When you write a LINQ query, the provider takes that query and translates it into commands that the data source will be able to execute. The provider also converts data from the source to the objects that make up your query result. Finally, it converts objects to data when you send updates to the data source. Linq namespace, which is imported by default for all Visual Basic projects. This makes it easy to map the object model for an application to the tables and objects in a database. This designer is used to create an object model in an application that maps to objects in a database. For more information, see XML. You can add the power of LINQ to applications that use datasets in order to simplify and extend your capabilities for querying, aggregating, and updating the data in your dataset. Structure of a LINQ query A LINQ query, often referred to as a query expression, consists of a combination of query clauses that identify the data sources and iteration variables for the query. A query expression can also include instructions for sorting, filtering, grouping, and joining, or calculations to apply to the source data. Query expression syntax resembles the syntax of SQL; therefore, you may find much of the syntax familiar. A query expression starts with a From clause. This clause identifies the source data for a query and the variables that are used to refer to each element of the source data individually. These variables are named range variables or iteration variables. The From clause is required for a query, except for Aggregate queries, where the From clause is optional. After the scope and source of the query are identified in the From or Aggregate clauses, you can include any combination of query clauses to refine the query. For example, the following query identifies a source collection of customer data as the customers variable, and an iteration variable named cust. Canada This example is a valid query by itself; however, the query becomes far more powerful when you add more query clauses to refine the result. For example, you can add a Where clause to filter the result by one or more values. Query expressions are a single line of code; you can just append additional query clauses to the end of the query. The following code example shows an example of a query that includes a Where clause. LINQ queries return enumerable collections of strongly typed objects. A query can return a collection of anonymous types or named types. You can use the Select clause to return only a single field from the data source. When you do this, the type of the collection returned is the type of that single field. You can also use the Select clause to return multiple fields from the data source. When you do this, the type of the collection returned is a new anonymous type. You can also match the fields returned by the query to the fields of a specified named type. The following code example shows a query expression that returns a collection of anonymous types that have members populated with data from the selected fields from the data source. Country LINQ queries can also be used to combine multiple sources of data and return a single result. This can be done with one or more From clauses, or by using the Join or Group Join query clauses. The following code example shows a query expression that combines customer and order data and returns a collection of anonymous types containing customer and order data. You can use the Group Join clause to create a hierarchical query result that contains a collection of customer objects. Each customer object has a property that contains a collection of all orders for that customer. The following code example shows a query expression that combines customer and order data Page 4

5 as a hierarchical result and returns a collection of anonymous types. The query returns a type that includes a CustomerOrders property that contains a collection of order data for the customer. It also includes an OrderTotal property that contains the sum of the totals for all the orders for that customer. The next section of this topic discusses the various query clauses that you can include in a query expression. For details about Visual Basic query clauses, see Queries. Linq namespace and the other namespaces that support LINQ queries include methods that you can call to create and refine queries based on the needs of your application. Visual Basic includes keywords for the following common query clauses. From clause Either a From clause or an Aggregate clause is required to begin a query. A From clause specifies a source collection and an iteration variable for a query. CompanyName Select clause Optional. A Select clause declares a set of iteration variables for a query. CustomerID If a Select clause is not specified, the iteration variables for the query consist of the iteration variables specified by the From or Aggregate clause. A Where clause specifies a filtering condition for a query. Name Order By clause] Optional. An Order By clause specifies the sort order for columns in a query. A Join clause combines two collections into a single collection. Description Group By clause Optional. A Group By clause groups the elements of a query result. It can be used to apply aggregate functions to each group. A Group Join clause combines two collections into a single hierarchical collection. An Aggregate clause applies one or more aggregate functions to a collection. For example, you can use the Aggregate clause to calculate a sum for all the elements returned by a query, as the following example does. Amount You can also use the Aggregate clause to modify a query. For example, you can use the Aggregate clause to perform a calculation on a related query collection. A Let clause computes a value and assigns it to a new variable in the query. UnitPrice, Discount Distinct clause Optional. A Distinct clause restricts the values of the current iteration variable to eliminate duplicate values in query results. City Distinct Skip clause Optional. A Skip clause bypasses a specified number of elements in a collection and then returns the remaining elements. A Skip While clause bypasses elements in a collection as long as a specified condition is true and then returns the remaining elements. A Take clause returns a specified number of contiguous elements from the start of a collection. A Take While clause includes elements in a collection as long as a specified condition is true and bypasses the remaining elements. You can use these additional capabilities by calling a particular query operator on the result of a query expression. For example, the following example uses the Enumerable. Union method to combine the results of two queries into one query result. It uses the Enumerable. ToList method to return the query result as a generic list. Union customers2 Return customerlist. This object includes properties and collections for the tables and views that you want access to, and methods for the stored procedures that you want to call. For examples with step-by-step instructions, see How to: Query a Database and How to: Call a Stored Procedure. These include the following: Anonymous types, which enable you to create a new type based on a query result. Implicitly typed variables, which enable you to defer specifying a type and let the compiler infer the type based on the query result. Extension methods, which enable you to extend an existing type with your own methods without modifying the type itself. Deferred and immediate query execution Query execution is separate from creating a query. After a query is created, its execution is triggered by a separate mechanism. A query can be executed as soon as it is defined immediate execution, or the definition can be stored and the query can be executed later deferred execution. By default, when you create a query, the query itself does not execute immediately. Instead, the query definition is stored in the variable that is used to reference the query result. When the query result variable is accessed later in code, such as in a Forâ Next loop, the query is executed. This process is referred to as deferred execution. Queries can also be executed when they are defined, which is referred to as immediate execution. You can trigger immediate execution by applying a method that requires access to individual elements of the query result. Page 5

6 Chapter 4 : Sample Forms for Visual Basic Express Addition The MultipleForms Example - Forms in Visual basic It's time to write an application that puts together the most important topics discussed in this section. The MultipleForms example consists of a main form, an auxiliary form, and a dialog box. Repeats a group of statements a specified number of times. The control variable for the loop. For more information, see Counter Argument later in this topic. Data type of counter. The initial value of counter. The final value of counter. The amount by which counter is incremented each time through the loop. One or more statements between For and Next that run the specified number of times. Transfers control to the next loop iteration. Transfers control out of the For loop. Terminates the definition of the For loop. Note The To keyword is used in this statement to specify the range for the counter. You can also use this keyword in the Select Case Statement and in array declarations. For more information about array declarations, see Dim Statement. Simple Examples You use a For Next structure when you want to repeat a set of statements a set number of times. In the following example, the index variable starts with a value of 1 and is incremented with each iteration of the loop, ending after the value of index reaches 5. The Step argument of -. End While Statement or Do However, when you expect to run the loop a specific number of times, a For Next loop is a better choice. You determine the number of iterations when you first enter the loop. Nesting Loops You can nest For loops by putting one loop within another. The following example demonstrates nested For Next structures that have different step values. The outer loop creates a string for every iteration of the loop. The inner loop decrements a loop counter variable for every iteration of the loop. Dim sb As New System. You can also nest different kinds control structures within each other. For more information, see Nested Control Structures. The Continue For statement transfers control immediately to the next iteration of the loop. For more information, see Continue Statement. The following example illustrates the use of the Continue For and Exit For statements. When used within nested Forâ Next loops, Exit For exits the innermost loop and transfers control to the next higher level of nesting. Exit For is often used after you evaluate some condition for example, in an If You might want to use Exit For for the following conditions: Continuing to iterate is unnecessary or impossible. An erroneous value or a termination request might create this condition. Finally statement catches an exception. You might use Exit For at the end of the Finally block. You have an endless loop, which is a loop that could run a large or even infinite number of times. If you detect such a condition, you can use Exit For to escape the loop. For more information, see Do Technical Implementation When a For Next loop starts, Visual Basic evaluates start, end, and step. Visual Basic evaluates these values only at this time and then assigns start to counter. Before the statement block runs, Visual Basic compares counter to end. If counter is already larger than the end value or smaller if step is negative, the For loop ends and control passes to the statement that follows the Next statement. Otherwise, the statement block runs. Each time Visual Basic encounters the Next statement, it increments counter by step and returns to the For statement. Again it compares counter to end, and again it either runs the block or exits the loop, depending on the result. This process continues until counter passes end or an Exit For statement is encountered. If counter is equal to end, the loop continues. If you change the value of counter while inside a loop, your code might be more difficult to read and debug. If you nest loops, the compiler signals an error if it encounters the Next statement of an outer nesting level before the Next statement of an inner level. However, the compiler can detect this overlapping error only if you specify counter in every Next statement. Step Argument The value of step can be either positive or negative. This parameter determines loop processing according to the following table: Page 6

7 Chapter 5 : Visual Basic Examples The RecordSave Example - Visual Basic Let's look at the code for saving structured information to a binary file. In this section, you'll build the RecordSave application, which demonstrates how to store a price list to a disk file and read it later from the same file. A simple hello world program that illustrates a basic VB program as well as the command button and timer control. The left figure shows when it looks like when the program is executed, while the right shows what happens after the user has clicked the button 3 times and selected the checkbox, and moved the mouse over the form. Try to program this yourself. It uses a command or button, a label, and a checkbox. James Tam These two vb Projects illustrates two ways to cycle through images stored in a local directory. Each demonstrates different controls for accessing files, while both show a control for displaying images. Saul Greenberg A marquee an automatically scrolling text region is used to illustrate a Timer, a status bar and a checkbox control, and simple graphical repositioning, Saul Greenberg An example of how to use listboxes as well as how to put images into buttons. This example lets you move items between lists. Saul Greenberg vbsketchpads Illustrates two simple sketchpads. The first one is only about 6 lines of code, and just illustrates some very basic graphics and event handling. The second shows how one can dynamically create controls at run time the items on the palette, how controls can be positioned at runtime, and how controls can be resized when the window is resized. Its a longer program, but well worth going through to see how these features work. See Tutorial 2 for step by step instructions for how these programs work. Saul Greenberg A simple object-oriented drawing editor that allows a user to create, move and erase squares. You can easily extend this to include different graphical classes e. The program illustrates how to do simple object-based interactive graphics in VB how to use a collection how to use a class Saul Greenberg vbdynamicqueries This program is similar to the drawing editor above, but used for completely different purposes. It illustrates how to do dynamic queries on city attributes, where cities on a map are filtered immediately as a person moves a slider or checks a checkbox. While the example is simple, the possibilities of how you can enhance it are endless. Click on the image to view it in full size. Saul Greenberg Illustrates how to create a very simple table lens that toggles cells between graphical and textual views. Rod Stephens Illustrates how to Bitblit a picture on another picture, and how to drag it around. Rod Stephens Illustrates how to use the Tree control and how to drag items around different parts of the tree Rod Stephens An example application that lets a user interactively move different kinds of controls on a display. Saul Greenberg Illustrates how to create a simple class that raises events Saul Greenberg vbflexdata-example Illustrates a database with the flex control. The database just has two fields: This example lets you add and remove records. The record is just added to the end of the file, but the flex grid shows it sorted. See also Tutorial 3 and Tutorial 4 for other ways to access databases. Shaun Kaasten Illustrates how you can clip the shape of a control or form to a variety of regions. Page 7

8 Chapter 6 : Microsoft Visual Basic In this tutorial I will teach you on how to create a Windows Application using Visual blog.quintoapp.com For the sake of this tutorial I will be using Library System as the system model. I came up with this idea in the hope to help beginner who wish to learn Visual blog.quintoapp.com the EASY WAY. Current version For new features, see Visual Basic NET Visual Basic Starting with Visual Basic This is particularly useful when named arguments are used to make code more readable. For example, the following method call has two positional arguments between a named argument. The named argument makes it clear that the value 19 represents an age. Because structures cannot be inherited, Private Protected can only be applied to the members of a class. The following example uses a leading digit separator to define 3,,, as a hexadecimal number: The following example uses inference to create a tuple with three named elements, state, statename, and capital. MI, Capital Lansing Additional compiler switches The Visual Basic command-line compiler now supports the -refout and -refonly compiler options to control the output of reference assemblies. Visual Basic Tuples are a lightweight data structure that most commonly is used to return multiple values from a single method call. Ordinarily, to return multiple values from a method, you have to do one of the following: Define a custom type a Class or a Structure. This is a heavyweight solution. Define one or more ByRef parameters, in addition to returning a value from the method. The following example wraps a call to the TryParse method and returns a tuple. InvariantCulture, number, number End Function End Module You can then call the method and handle the returned tuple with code like the following. The following example uses both features to assign a Byte value and to display it as a decimal, hexadecimal, and binary number. That is, when the calling method receives a value returned by reference, it can change the value of the reference. Visual Basic does not allow you to author methods with reference return values, but it does allow you to consume and modify the reference return values. For example, the following Sentence class written in C includes a FindNext method that finds the next word in a sentence that begins with a specified substring. The string is returned as a reference return value, and a Boolean variable passed by reference to the method indicates whether the search was successful. This means that the caller can not only read the returned value; he or she can also modify it, and that modification is reflected in the Sentence class. Note that you are not assigning a value to the method, but rather to the expression that the method returns, which is the reference return value. Dim sentence As New Sentence "A time to see the world is now. A problem with this code, though, is that if a match is not found, the method returns the first word. Since the example does not examine the value of the Boolean argument to determine whether a match is found, it modifies the first word if there is no match. The following example corrects this by replacing the first word with itself if there is no match. FindNext "B", found Console. A better solution is to use a helper method to which the reference return value is passed by reference. The helper method can then modify the argument passed to it by reference. The following example does that. FindNext "A", found, "A good", found Console. For more information, see Reference Return Values. Visual Basic 14 Nameof You can get the unqualified string name of a type or member for use in an error message without hard coding a string. This allows your code to remain correct when refactoring. This feature is also useful for hooking up model-view-controller MVC links and firing property changed events. Page 8

9 Chapter 7 : Visual Basic Sample Applications Microsoft Docs Visual blog.quintoapp.com is an object-oriented version of the popular Visual Basic programming language that was introduced originally in the early s. The,.net refers to the updated versions of Visual Basic, or simply VB that is based on the blog.quintoapp.com Framework. From the new project dialog select Windows Application and name the project myvbapp and click on Ok to create the new project. Once the new project is created, Visual Studio will display a blank form ready for us to design the user interface of the application. Adding Controls to the Form For the purposes of our example Visual Basic application we are going to add two controls to our form; a push button and a label. To achieve this we first need to access the Visual Studio Toolbox. Along the left hand side of the Visual Studio main window you should see a tab labeled Toolbox. Click on this tab to display the Toolbox. It should appear as follows: This Toolbox contains all the controls that may be used to build a Graphical User Interface for a Windows application. The toolbox will auto-hide by default, that is it will disappear when the mouse pointer is moved away from it. To make it permanently visible click on the push pin icon at the top of the toolbox window. Once it is pinned in place it will not auto-hide. It is also possible to detach the toolbox so that it will float and can be positioned anywhere on the desktop. To do so, simply click on the toolbox title area and drag it. Controls are added to the Form by clicking on the required control in the Toolbox and dragging it to the desired location on the Form. To add a label to the form, click on the Label control in the Toolbox, drag it to the center of the Form and release the mouse button. The new label will then appear in the Form at the point you dropped it. Next we need to add a button. Grab a Button from the Toolbox and drag and drop it on the Form. Use the mouse to move the controls around the Form until you have a layout you are happy with. Setting Control Properties Now that we have added the controls to our Form we need to change some of the characteristics of these controls. This is done by changing the Properties of the controls. Properties are a group of settings that allow the appearance and behavior of controls to be changed. For example, there is a property for changing the text displayed on a label, the color of a button, the font of the text on a button and so on. Properties of a control are changed using the Visual Studio Properties panel which is, by default, displayed in the bottom right hand corner of the main dialog: The properties displayed at any one time are related to the currently selected control in the Form. If you click on the Label and then the Button in your Form you will see the properties panel change to reflect the current selection. To begin with, we will change the text of the Label control. Select the Label control in the form and then scroll down the list of properties until you find Text. This is the property which defines the text to be displayed on the currently selected Label control. Notice that as soon as you change this property the Label in the Form changes to reflect the new property setting. Re-position the controls in the Form if necessary. You should now have a Form which looks something like the following: Creating an Event Handler The next step is to make the Close button do something when it is pressed. Before we do that, however, we need to give the button a more meaningful name. Visual Studio has given the button a default name of Button1. While this is fine for a small design, it will quickly become difficult to work with such names in larger applications containing many buttons. With the Button selected in the Form, scroll up to the top of the properties list and change Name from Button1 to closebutton. Having changed the name we can now add an event to the button. Double click on the Button in the Form to display the event code for the closebutton control. Visual Studio will display the following code: Object, ByVal e As System. Click End Sub This is a Visual basic Subroutine where code is placed to define what happens when a Click event is detected on the button i. In this example we want the application to close when the closebutton is pressed. Assuming there are no problems the application should compile without any errors the message Build succeeded should appear in the status bar at the bottom of the Visual Studio screen. Once built, the application can be run by selecting Start Debugging from the Debug menu. An even quicker way of building and running the application is to simply press F5. This will compile and run the application without having to use any menu options. As you develop Visual Basic applications in Visual Studio you will find yourself using the F5 shortcut more than any other key on your keyboard. After a few seconds the application should appear Page 9

10 just as you designed it in the Visual Studio designer: Try out the Click event on the closebutton control by clicking on the Close button to close the application. Congratulations - you have designed, built and run your first Visual Basic application. Chapter 8 : ForNext Statement (Visual Basic) Microsoft Docs The FileSystemWatcher example in Visual Basic The FileSystemWatcher project, shown in Figure, demonstrates how to set up a FileSystemWatcher component and how to process the events raised by the component. Chapter 9 : Regular Expressions in SQL SERVER visual basic examples, Microsoft Office, Visual C++ Express Edition, Visual Basic Express Edition -. Page 10