private void BindCityFrom()
{
PurchaseBillDAL obj = new PurchaseBillDAL();
var ToCity = obj.BindFromCity();
obj = null;
drpCityFrom.DataSource = ToCity;
drpCityFrom.DataTextField = "City_Name";
drpCityFrom.DataValueField = "City_Idno";
drpCityFrom.DataBind();
drpCityFrom.Items.Insert(0, new ListItem("--Select--", "0"));
}