public void GetInstructors()
        {
            if (Request.QueryString["CourseID"] != null)
            {
                BEAdmin objBEAdmin = new BEAdmin();
                BAdmin  objBAdmin  = new BAdmin();
                objBEAdmin.IntCourseID = Convert.ToInt32(Request.QueryString["CourseID"].ToString());
                objBAdmin.BGetCoursePrimaryInstructors(objBEAdmin);
                if (objBEAdmin.DtResult.Rows.Count > 0)
                {
                    lblCourseName.Text = objBEAdmin.DtResult.Rows[0][2].ToString();
                    rcbInstructor.AppendDataBoundItems = true;
                    // rcbStudent.Items.Add(new RadComboBoxItem("--Select Student--", "-1"));
                    rcbInstructor.DataSource     = objBEAdmin.DtResult;
                    rcbInstructor.DataTextField  = "InstructorName";
                    rcbInstructor.DataValueField = "InstructorID";
                    rcbInstructor.DataBind();


                    foreach (RadComboBoxItem item in rcbInstructor.Items)
                    {
                        foreach (DataRow dr in objBEAdmin.DtResult.Rows)
                        {
                            if (item.Value == dr[0].ToString())
                            {
                                if (dr[3].ToString() == "true")
                                {
                                    item.Checked = true;
                                }
                                break;
                            }
                        }
                    }
                }
            }
        }