public DataTable getDataDoiTac(BackgroundWorker worker, DoWorkEventArgs e)
{
if (worker.CancellationPending == true)
{
e.Cancel = true;
return(null);
}
else
{
DoiTac objDoiTac = new DoiTac();
return(objDoiTac.GetListOfDoiTacs_NAME());
System.Threading.Thread.Sleep(500);
}
}