private void frmPrincipal_FormClosing(object sender, FormClosingEventArgs e)
 {
     try
     {
         if (agregarVenta.HayProductos)
         {
             DialogResult confirmacion = MessageBox.Show(this, "¿Desea guardar la venta actual?\n", "Confirmación", MessageBoxButtons.YesNo, MessageBoxIcon.Question);
             if (confirmacion == DialogResult.Yes)
             {
                 GuardarVenta.Guardar(agregarVenta.Guardar());
             }
             else
             {
                 agregarVenta.Cancelar();
             }
         }
         else if (File.Exists(Application.StartupPath + "\\Maxima_Distribuidores_VS.xml"))
         {
             File.Delete(Application.StartupPath + "\\Maxima_Distribuidores_VS.xml");
         }
         Directory.Delete(Application.StartupPath + "\\corte\\", true);
         Directory.Delete(Application.StartupPath + "\\reportes\\", true);
     }
     catch (Exception) { }
     Usuario.DestruirInstancia();
 }