ADO.NET Cookbook

1.16. Setting Connection Pooling Options

Problem

You need to know the different connection pooling options and how you can control them.

Solution

Use the connection string to control connection pooling for the SQL Server, OLE DB .NET, Oracle, or ODBC.NET data provider.

The sample code contains a method and four event handlers:

Form.Load

Creates a Connection, attaches an event handler to its StateChange event, and sets default properties for controls on the form that are used to specify connection properties. The UpdateConnection( ) method is called to dynamically construct a connection string from the specified properties.

UpdateConnectionString( )

This method dynamically constructs a connection string from the connection string properties specified by the user in text boxes on the form. This method is called to update the connection string when the user changes the value of any of the controls used to specify connection string properties.

Open Button.Click

Opens the Connection that is based on the connection string constructed in the UpdateConnectionString( ) method.

Close Button.Click

Closes the connection string.

Connection.StateChange

Displays original and current state information about the connection when its state changes.

The C# code is shown in Example 1-11.

Example 1-11. File: ConnectionPoolingOptionsForm.cs

// Namespaces, variables, and constants using System; using System.Configuration; using System.Windows.Forms; using System.Data; using System.Data.SqlClient; private SqlConnection ...