protected void modDeleteCommand(Object sender, GridViewDeleteEventArgs e)
        {
            string            id = GridView1.DataKeys[e.RowIndex].Value.ToString();
            ClassPositionWork pw = new ClassPositionWork();

            pw.POSITION_WORK_ID = id;
            pw.DeletePositionWork();
            ScriptManager.RegisterClientScriptBlock(this, this.GetType(), "alertMessage", "alert('ลบข้อมูลเรียบร้อย')", true);

            GridView1.EditIndex = -1;
            BindData1();
        }