void GetData()
{
bool dba;
if (rdnhanvien.IsChecked==true)
dba=true;
else
dba=false;
grid.ShowLoadingPanel = true;
QLThuebaoDomainContext db = new QLThuebaoDomainContext();
InvokeOperation<System.Nullable<int>> p = db.Excute_TKsoluongtbGanNV(App.kythuat,dba);
p.Completed += new EventHandler(Completed);
}