Connection event: state changed and information : SqlConnection « ADO.Net « C# / CSharp Tutorial

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C# / CSharp Tutorial » ADO.Net » SqlConnection 
32.13.8.Connection event: state changed and information
using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Data.SqlClient;

public class MainClass{
   public static void Main(){
    SqlConnection cn = new SqlConnection();

    try
    {
      cn.StateChange += new StateChangeEventHandler(StateChange);
      cn.InfoMessage += new SqlInfoMessageEventHandler(InfoMessage);

      cn.ConnectionString = "server=(local)\\SQLEXPRESS;database=MyDatabase;Integrated Security=SSPI;";
      cn.Open();
      cn.ChangeDatabase("Biblio");

    }
    catchException ex )
    {
      Console.WriteLine(ex.Message);
    }
    finally
    {
      // Unsubscribe from the Events we subscribed to.
      cn.StateChange -= new StateChangeEventHandler(StateChange);
      cn.InfoMessage -= new SqlInfoMessageEventHandler(InfoMessage);
    }
   }
  private static void StateChange(object sender, System.Data.StateChangeEventArgs e)
  {
    Console.WriteLine("State was:" + e.OriginalState.ToString() ". New state = " + e.CurrentState.ToString() );
  }
  
  private static void InfoMessageobject sender, System.Data.SqlClient.SqlInfoMessageEventArgs e)
  {
    int i;
    for (i=0; i < e.Errors.Count; i++ )
    {
      Console.WriteLine(e.Errors[i].Message);
    }
  }

}
State was:Closed. New state = Open
Could not locate entry in sysdatabases for database 'Biblio'. No entry found with that name. Make su
re that the name is entered correctly.
32.13.SqlConnection
32.13.1.Connect to SQLserver
32.13.2.Deal with connection exception
32.13.3.Show the connection properties for SqlConnection
32.13.4.Properties of SqlConnection
32.13.5.SqlConnection connection state
32.13.6.Obtain a pooled connection
32.13.7.Obtain a nonpooled connection
32.13.8.Connection event: state changed and information
32.13.9.Setting Connection Pooling Options
32.13.10.Set AttachDbFilename in connection string
32.13.11.Opens and verifies a connection
32.13.12.Connect to SqlServer Named Instance
32.13.13.Connect to SqlServer and set the IP Address
32.13.14.Connect to SqlServer with Integrated security
32.13.15.Connect to SqlServer with password and id
32.13.16.Connection Display
32.13.17.Get Sql Statistics
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