private void MtxRutDeudor_Leave(object sender, EventArgs e) { Boolean bdeudor = true; String RutDeudor = MtxRutDeudor.Text; RutDeudor = RutDeudor.Replace(",", ""); Valida oVal = new Valida(); bdeudor = oVal.Rut(RutDeudor); if (bdeudor == false && RutDeudor != " -") { MessageBox.Show("No es un rut valido, ingrese nuevamente"); MtxRutDeudor.Clear(); MtxRutDeudor.Focus(); } }