SqlConnection state change event : SqlConnection « Database ADO.net « C# / C Sharp

1. C# / C Sharp
2. Database ADO.net
3. SqlConnection

SqlConnection state change event

using System;
using System.Data;
using System.Data.SqlClient;

   class SqlDemo {
      static void Main(){
         string connString = "server=(local)\\SQLEXPRESS;database=MyDatabase;Integrated Security=SSPI";

         SqlConnection cn = new SqlConnection(connString);

         SqlCommand cmd = new SqlCommand();
         cmd.CommandText = "SELECT TOP 1 Id, FirstName FROM Employee";
         cmd.Connection = cn;
         cn.StateChange += new StateChangeEventHandler(CnStateChange);

         try
         {
            cn.Open();
            SqlDataReader dr = cmd.ExecuteReader();
            while(dr.Read()) {
               Console.WriteLine(dr.GetString(0) + "-" + dr.GetString(1));
            }
         }
         catch(SqlException e1)
         {
            Console.WriteLine(e1.Message);
         }
         finally
         {
            cn.Close();
         }
      }


      static void CnStateChange(object sender, StateChangeEventArgs ev)
      {
         Console.WriteLine("------------------------------");
         Console.WriteLine("Entering StateChange EventHandler");
         Console.WriteLine("Sender = "+ sender.ToString());
         Console.WriteLine("Original State = "+ ev.OriginalState.ToString());
         Console.WriteLine("Current State = "+ ev.CurrentState.ToString()); 
         Console.WriteLine("Exiting StateChange EventHandler");
         Console.WriteLine("------------------------------");
      }

   }
           
       

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