public ModificarItemFactura(ModificarFactura parent, int id, double monto, int cantidad, string concepto)
{
this.parent = parent;
this.id = id;
InitializeComponent();
txtConcepto.Text = concepto;
txtMonto.Text = monto.ToString();
txtCantidad.Text = cantidad.ToString();
}
public AgregarItemFactura(ModificarFactura parent)
{
this.parent = parent;
InitializeComponent();
}