protected void insert_courses1(object sender, EventArgs e)
    {
        BLItem objBL     = new BLItem();
        string sectionID = dd1.SelectedItem.Text;
        string courseID  = dd.SelectedValue;
        string teacherID = empID.Text;

        objBL.enter_teacher_courses(teacherID, courseID, sectionID);
        ScriptManager.RegisterClientScriptBlock(this, this.GetType(), "alertMessage", "alert('Registration Is Successfull.')", true);
    }