public partial class _Default : System.Web.UI.Page 
{
    protected void Page_Load(object sender, EventArgs e)
    {
     
    }
    protected void Button1_Click(object sender, EventArgs e)
    {

 
//creating connection object for sql connection.
       try
         {
            SqlConnection cn = new SqlConnection("user id=sa;password= ");
            cn.Open();
        }
//catching the exception
        catch (SqlException  ex)
        {
         
        
     string msg = "";
//iterating through types of errors      

      for (int i = 0; i < ex.Errors.Count; i++)
            {
                msg += "index#" + i + "\n" + "message" + ex.Errors[i].Message + "\n" + "linenumber" + ex.Errors[i].LineNumber + "\n" + "source" + ex.Errors[i].Source + "\n" + "procedure" + ex.Errors[i].Procedure;

            

            }
//errors r logged into eventlog .
         System.Diagnostics.EventLog log = new System.Diagnostics.EventLog();
            log.Source = "myapplication";
            log.WriteEntry(msg);
            Response.Write("an exception occured.Please contact u'r admin..."); 
       
        }
    }
}