protected void GridView2_RowCommand(object sender, GridViewCommandEventArgs e) { if (e.CommandArgument != null) { if (e.CommandName.ToLower() == "cmddelete") { int p = Convert.ToInt32(e.CommandArgument); TrainBLL tbll = new TrainBLL(); tbll.deletebook(p); Label4.Text = "Deleted successfully of id " + p; } } }