private void LoadGrid()
 {
     try
     {
         BLItem objBL = new BLItem();                                                                    // declare and initialize BLItem object
         teacher_course_info.DataSource = objBL.Get_Employee_Current_Courses(Session["New"].ToString()); //setting data source for the gridview
         teacher_course_info.DataBind();                                                                 //bind the data source to the gridview
     }
     catch (SqlException)
     {
         throw;
     }
 }