Contents. Chapter 1 Introducing ADO.NET...1. Acknowledgments...xiii. About the Authors...xv. Introduction...xix

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1 Acknowledgments...xiii About the Authors...xv Introduction...xix Chapter 1 Introducing ADO.NET...1 How We Got Here...2 What Do These Changes Mean?...5 ADO.NET A New Beginning...7 Comparing ADOc and ADO.NET...8 Understanding ADO.NET Infrastructure...9 Understanding ADO.NET s Distributed Architecture...10 A Brief Look at XML...11 ADO.NET The Fundamentals...12 ADO.NET.NET Data Providers...15 Leveraging Existing COM-based ADO Code...17 Creating DataSets from ADOc Recordset Objects...19 How COM Interop Affects.NET Applications...19 ADO.NET and Disconnected Data Structures...20 The System.Data Namespace...21 The ADO.NET DataSet Object...22 Descending the System.Data Namespace Tree...26 Instantiating System.Data Objects...30 Introducing the ADO.NET DataAdapter...31 ADO.NET s Low-Level Data Stream...36 vii

2 Chapter 2 ADO.NET Getting Connected...39 ADO.NET.NET Data Providers...40 Choosing the Right Provider...41 Creating ADO.NET Connection Objects...42 Using Constructors in Declarations...43 Building an ADO.NET ConnectionString...44 Connecting via the SqlClient.NET Data Provider...51 Introducing System.Data.SQLClient...51 Examining the Connection Object Properties...53 Examining Connection Object Methods...55 Sinking Connection Object Events...56 Managing Transactions...59 Connecting with the Odbc.NET Data Provider...59 Using the Odbc.NET Data Provider...60 Managing the Odbc.Connection Object...61 ODBC Connection Strings...64 Opening ADO.NET Connections in Code...65 Using the IDE to Get Connected...66 Adding Connections...66 Closing Connections...68 Managing the ADO.NET Garbage Collector...68 Connection Information and Security...69 ADO.NET Connection Pooling...71 OleDb and Odbc Connection Pooling...75 Debugging the Connection Pool...75 COM-based ADO as a.net Data Provider...75 Instantiating Your ADOc Namespace...76 Chapter 3 ADO.NET Command Strategies...79 Understanding ADO.NET Commands...79 Introducing ADO.NET Parameter Queries...82 Executing Ad Hoc Queries Using ADO.NET...84 Constructing SQL for your Query...85 Creating a DataSet with the IDE...98 Using Drag-and-Drop with the IDE Managing Parameter Queries Managing Multiple-Table Queries Managing Stored Procedure Queries Managing Multiple-Resultset Queries Exploring the Command Execute Methods Binding to Resultset Columns viii

3 Chapter 4ADO.NET DataReader Strategies Comparing ADOc with ADO.NET Understanding the DataReader Using the DataReader Get Methods to Retrieve Data Using GetValues to Fetch a Row Cleaning Up After Your DataReader Chapter 5 Using the DataTable and DataSet Understanding the DataSet and DataTable Structure Typed Versus Untyped DataSets Importing ADOc Recordsets Comparing ADOc Recordsets and DataTable Objects Building DataTables Building DataTables with the Constructor Building DataTables Using the DataAdapter Fill Method Building DataTable Objects Within a DataSet Using FillSchema to Retrieve DDL Accessing DataTable Data Accessing the DataColumnCollection (Columns) Understanding the DataRow Object Accessing the DataRowCollection (Rows) Testing for Results Accessing DataSet Data Positioning the Current Row Pointer Binding to DataSets Chapter 6 Filtering, Sorting, and Finding Filtering and Sorting with the Select Method Sorting with the Select Method Filtering on RowState and Version Filtering and Sorting with the DataView Object Setting DataView Filter Properties Creating DataView Objects with Visual Studio Updating a DataView Working with the DataViewManager The DefaultViewManager Property Using the Find Methods The Rows Collection Find Method The DataView Object s Find Method The Rows Collection Contains Method ix

4 Chapter 7 ADO.NET Update Strategies Changing Data The Fundamentals Addressing the Value Property with Untyped Datasets Addressing the Value Property with Typed Datasets Creating New DataRows Deleting DataSet Rows Undoing a Delete Operation Postponing Constraint Enforcement Using BeginEdit Data Validation Checking RowState Update Strategies Creating Updatable DataSets Using the CommandBuilder Class Using Visual Studio to Generate Action Queries Reviewing the Generated Stored Procedures Reviewing the Generated Code Retrieving Autonumber, Identity, or GUIDs Understanding the Update Methods Update Performance Another Approach to Bulk Inserts: Use XML Updating the Authors Table An Example Working with an Updatable DataGrid Control Showing the Available Data Versions Showing the Row Counts Using GetChanges to Manage Modified Rows Update Exception Handling Strategies Using the ContinueAfterError Property What to Do When an Update Fails Handling Update Method Exceptions Coding the Update DBConcurrencyException Trap Executing Ad Hoc Queries to Perform Updates Merging and Transporting Data Chapter 8 ADO.NET Constraint Strategies x Understanding.NET Constraints How ADO.NET Implements Constraints Managing the Constraints Collection Implementing Unique Constraints Implementing Foreign Key Constraints Understanding Parent/Child Primary Key/Foreign Key Relationships Using the FillSchema Method Creating DataRelation Objects...295

5 Chapter 9 ADO.NET Exception Management Strategies..301 Structured Exception Handling Understanding try/catch try/catch Syntax Standard Exceptions Variable Scope in try/catch Blocks Exceptions That Fire Outside of try/catch Scope Nesting Exception Handlers Trapping Specific vs. General Exceptions The System.Data Exceptions The SqlException Class The SqlError Class The OleDbException Class Displaying the Error Message Chapter 10 ADO.NET and XML XML Support in ADO.NET Standardizing on XML Formats Understanding XML and DataSet Objects Importing DataSet Data from an XML Document What Are DiffGrams? Merging XML Data with Your DataSet Fetching and Saving DataSet Objects as XML Loading Schema from XML Persisting XML Schema Creating a Web Service as an XML Data Source Passing an Updated DataSet Back to a Web Service Creating Custom Exception Handlers ADO.NET and SOAP Appendix Working with the Biblio Sample Database Index xi

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