Opening database connection is a time consuming operation. Connection pooling increases the performance of the applications by reusing the active database connections instead of create new connection for every request. Connection pooling Behavior is controlled by the connection string parameters. Following the the 4 parameters that control most of the connection pooling behavior. 1. Connect Timeout 2. Max Pool Size 3. Min Pool Size 4. Pooling Please go through the following link as well http://support.microsoft.com/default.aspx?scid=kb;EN-US;q169470