protected void TeacherDropDownList_SelectedIndexChanged(object sender, EventArgs e)
        {
            int TeachersId = Convert.ToInt32(TeacherDropDownList.SelectedValue);
            var successe   = _CourseAssigneManager.GetTeacherData(TeachersId);

            if (successe != null)
            {
                txtCreditTaken.Text = Convert.ToDecimal(successe.CreditTaken).ToString("0");
                RemainingCredit();
            }
            else
            {
                ClientScript.RegisterStartupScript(this.GetType(), "alert", "alert('Please Check Teacher Id');", true);
            }
        }