Perform the Edit//Cancel//Update//Delete function of the DataGrid.

this.DataGrid1.ItemCommand += new System.Web.UI.WebControls.DataGridCommandEventHandler(this.DataGrid1_ItemCommand);

private void DataGrid1_ItemCommand(object source, System.Web.UI.WebControls.DataGridCommandEventArgs e)
  {
   switch(((LinkButton)e.CommandSource).CommandName)
   {
    case "Edit":
     try
     {
      this.DataGrid1.EditItemIndex = e.Item.ItemIndex;
      this.binddata();
     }
     catch(Exception ex)
     {
      this.errorLabel.Text = ex.Message ;
     }
     break;
    case "Cancel":
     try
     {
      this.DataGrid1.EditItemIndex = -1;
      this.binddata();
     }
     catch(Exception ex)
     {
      this.errorLabel.Text = ex.Message ;
     }
     break;
    case "Delete":
     try
     {
      this.DataGrid1.EditItemIndex = -1;
      //update record
      int newsId = Convert.ToInt32(e.Item.Cells[0].Text);
      
      cmd = new SqlCommand();
      conn = new SqlConnection(db.connection);
      cmd.Connection = conn;
      cmd.CommandType = CommandType.StoredProcedure;
      cmd.CommandText = "deletenews";
//      cmd.Parameters.Add("@newsid",SqlDbType.Int).Value = newsId;
      cmd.Parameters.Add("@newsid",SqlDbType.Int);
      cmd.Parameters[0].Value = newsId;
      conn.Open();
      if(cmd.ExecuteNonQuery() == 0)
      {
       this.errorLabel.Text = "account error!";
      } 
      conn.Close();
      this.binddata();
     }
     catch(Exception ex)
     {
      this.errorLabel.Text = ex.Message ;
     }
     break;
    case "Update":
     try
     {
      this.DataGrid1.EditItemIndex = -1;
      //update record
      int newsId = Convert.ToInt32(e.Item.Cells[0].Text);
      string title = ((TextBox)(e.Item.Cells[1].Controls[0])).Text.Trim();
      string content = ((TextBox)(e.Item.Cells[2].Controls[0])).Text.Trim();
  
      cmd = new SqlCommand();
      conn = new SqlConnection(db.connection);
      cmd.Connection = conn;
      cmd.CommandType = CommandType.StoredProcedure;
      cmd.CommandText = "updatenews";
      cmd.Parameters.Add("@newsid",SqlDbType.NVarChar).Value = newsId;
      cmd.Parameters.Add("@title",SqlDbType.NVarChar).Value = title;
      cmd.Parameters.Add("@content",SqlDbType.NVarChar).Value = content;
    
      conn.Open();
      if(cmd.ExecuteNonQuery() == 0)
      {
       this.errorLabel.Text = "account error!";
      } 
      conn.Close();
      this.binddata();
     }
     catch(Exception ex)
     {
      this.errorLabel.Text = ex.Message ;
     }
     break;
    default:
     break;
   }
  }