private void btnOK_Click(object sender, EventArgs e) { if (!SpecialSetting.IsValidText(textEditor.RichTextBox.Text)) { Messages.ShowWarningOk(this, SpecialSetting.WarningText); textEditor.Focus(); return; } TargetRule = SpecialSetting.ParseFrom(textEditor.RichTextBox.Text); DialogResult = DialogResult.OK; }