private IBindingList GetCellsDataContext()
    {
      var irDistinct = (from ir in spe.InformRegions
                        select new { ir.PlaceId, ir.PostOffice }).Distinct();

      return ((from sel in irDistinct
               orderby sel.PlaceId
               select new
               {
                 sel.PlaceId,
                 PostOffice = sel.PostOffice.Substring(0, sel.PostOffice.IndexOf('-'))
               }) as IListSource).GetList() as IBindingList;

    }
private void Window_MouseDown(object sender, MouseButtonEventArgs e)
    {
      ListViewMain.DataContext = GetCellsDataContext();
    }