private void btnExport_Click(object sender, RoutedEventArgs e)
{
if (DsPrint.Tables[0].DefaultView.Count == 1)
{
string file_name = StartUp.GetFileNameExportWithSignature(DsPrint.Tables[0].DefaultView[0]);
IntPtr windowHandle = new WindowInteropHelper(this).Handle;
GridSearch.V_XuatPdf(file_name, windowHandle);
}
}