public void BinddropdownDistrictName()
{
DataTable dt = new DataTable();
dt = ddo.DistrictName();
DropdownDistrict.DataSource = dt;
DropdownDistrict.DataTextField = "DistrictName";
DropdownDistrict.DataValueField = "DistrictId";
DropdownDistrict.DataBind();
DropdownDistrict.Items.Insert(0, new ListItem {
Text = "--Choose-District--", Value = "0"
});
}