void TlbImprimirClick(object sender, EventArgs e)
{
var startOfMonth = new DateTime(Convert.ToInt32(cmbAno.Text), Convert.ToInt32(cmbMes.Text), 1);
var DaysInMonth = DateTime.DaysInMonth(Convert.ToInt32(cmbAno.Text), Convert.ToInt32(cmbMes.Text));
var lastDay = new DateTime(Convert.ToInt32(cmbAno.Text), Convert.ToInt32(cmbMes.Text), DaysInMonth);
DataTable TFactCIva = OperacionesComunes.TablaChequesFacturasCIVA(startOfMonth, lastDay);
Imprimir.Imprimir_ListadoDeFactCIva(TFactCIva);
}