private void PopulateUsedInvoices()
{
gridUsedInvoices.ItemsSource = ClsPEZAData.GetPEZA8112itemInvoices(tbPEZAFormNumber.Text.Trim()
).DefaultView;
if (gridUsedInvoices.Items.Count > 0)
{
btnRemove8106.IsEnabled = false;
}
else
{
btnRemove8106.IsEnabled = false;
}
}