private void Reset()
 {
     Exam.ClearSelection();
     dd.ClearSelection();
     TxtFDate.Text = string.Empty;
     //TxtTDate.Text = string.Empty;
     dd1.ClearSelection();
     section.ClearSelection();
     TxtStartTime.Text = string.Empty;
     TxtMaxMarks.Text  = string.Empty;
     TxtEndTime.Text   = string.Empty;
 }