protected void butCargabeb_Click(object sender, EventArgs e)
        {
            int val = 0;

            if (int.TryParse(txtcantbeb.Text, out val))
            {
                int cant = 0;
                cant = negoBebida.CantidadBebidas(Convert.ToInt64(ddlbebida.SelectedItem.Value));
                if (cant >= Convert.ToInt32(txtcantbeb.Text))
                {
                    LabErrorBe.Text = "*";
                    cargarGrilla();
                    negoPe.AgregarBebidaPla(Convert.ToInt64(ddlbebida.SelectedItem.Value),
                                            Convert.ToInt64(Session["idMesa"]), Convert.ToInt64(txtcantbeb.Text),
                                            Convert.ToInt64(Session["id"])
                                            );
                    cargarGrilla();
                    CargaBebida();
                }
                else
                {
                    LabErrorBe.Text = "Solo quedan " + cant + " de " + ddlbebida.SelectedItem.Text;
                }
            }
            else
            {
                LabErrorBe.Text = "Debe ingresar numeros";
            }
            negome.LiberarMesa(Convert.ToInt64(Session["idMesa"]), true);
        }