public void setCmbSemester()
{
systemManager objsystemManager = new systemManager();
cmbSemster.DataSource = objsystemManager.GetSemeDatatoStuSemAllocation();
cmbSemster.ValueMember = "SemesterID";
cmbSemster.DisplayMember = "SemesterCode";
//because of this department combo's display inedex will shown as a blank index
cmbSemster.SelectedIndex = -1;
}