public void GetDesignations()
{
DesignationDropDownList.DataSource = _TeachersManager.GetDesignations();
DesignationDropDownList.DataTextField = "DesignationName";
DesignationDropDownList.DataValueField = "Id";
DesignationDropDownList.DataBind();
DesignationDropDownList.Items.Insert(0, new ListItem("Select Designation", "0"));
Teachers _Teachers = new Teachers();
_Teachers.DesignationId = Convert.ToInt32(DesignationDropDownList.SelectedValue);
}