Ever need to display a message box for “Do not show again”, “auto-close”, “Open links”, specify how many buttons on a dialog along with the text? These are just a few example found in the following GitHub repository which shows how to use these options in both Windows Forms and WPF projects using a common class project created with .NET Core, C# 9.

For VB.NET see the following code sample.

Name: Example16.jpg Views: 1084 Size: 37.8 KB

Suppose there is a need for displaying a dialog that needs to perform actions?

Code:
public static void Question(Control owner, string heading, Action yesAction, Action noAction)
{

    TaskDialogButton yesButton = new("Yes") { Tag = DialogResult.Yes };
    TaskDialogButton noButton = new("No") { Tag = DialogResult.No };

    var buttons = new TaskDialogButtonCollection
    {
        yesButton,
        noButton
    };
    

    TaskDialogPage page = new()
    {
        Caption = "Question",
        SizeToContent = true,
        Heading = heading,
        Icon = new TaskDialogIcon(Properties.Resources.QuestionBlue),
        Buttons = buttons
    };
    
    var result = TaskDialog.ShowDialog(owner, page);

    if ((DialogResult)result.Tag == DialogResult.Yes)
    {
        yesAction?.Invoke();
    }
    else
    {
        noAction?.Invoke();
    }
    
}
Specify a custom Icon (here hard coded while there are other samples that accept an Icon to be fluid), an option to center the dialog on a form or window? The following does both along with setting the default button.

Code:
public static bool Question(IntPtr owner, string caption, string heading, string yesText, string noText, DialogResult defaultButton = DialogResult.No)
{

    TaskDialogButton yesButton = new(yesText) { Tag = DialogResult.Yes };
    TaskDialogButton noButton = new(noText) { Tag = DialogResult.No };

    var buttons = new TaskDialogButtonCollection();

    if (defaultButton == DialogResult.Yes)
    {
        buttons.Add("yesButton");
        buttons.Add("noButton");
    }
    else
    {
        buttons.Add(noButton);
        buttons.Add(yesButton);
    }
    
    TaskDialogPage page = new()
    {
        Caption = caption,
        SizeToContent = true,
        Heading = heading,
        Icon = new TaskDialogIcon(Properties.Resources.question32),
        Buttons = buttons
    };

    var result = TaskDialog.ShowDialog(owner, page, TaskDialogStartupLocation.CenterOwner);

    return (DialogResult)result.Tag == DialogResult.Yes;

}
Do not show again code works with a json configuration file with code to abide by the user's choice and method to reset.

Code:
public static (NoShowResult DialogResult, bool showAgain) DoNotShowAgain(ShowAgainOptions options)
{

    TaskDialogPage page = new ()
    {
        Heading = options.Heading,
        Text = options.Text,
        Caption = options.Caption,
        Icon = new TaskDialogIcon(options.Icon),
        AllowCancel = true,
        Verification = new TaskDialogVerificationCheckBox()
        {
            Text = options.VerificationText
        },
        Buttons = new TaskDialogButtonCollection()
        {
            TaskDialogButton.Yes, TaskDialogButton.No
        },
        DefaultButton = TaskDialogButton.No
    };

    if (TaskDialog.ShowDialog(options.IntPtr,page) == TaskDialogButton.Yes)
    {

        bool showAgain = false;

        if (page.Verification.Checked)
        {
            SettingOperations.SetShowAgain(false);
            showAgain = false;
        }
        else
        {
            SettingOperations.SetShowAgain(true);
            showAgain = true;
        }

        return (NoShowResult.StopOperation, showAgain);

    }
    else
    {

        return (NoShowResult.No, true);

    }

}
Auto-close, in this case partly hard coded with room to expand.

Code:
public static void AutoCloseDialog(IntPtr owner, Icon Icon, int seconds, string text, string okText = "OK", string cancelText = "Cancel")
{

    var remaining = seconds * 10;

    TaskDialogButton continueButton = new(okText);
    TaskDialogButton cancelButton = new(cancelText);

    TaskDialogPage page = new()
    {
        Heading = "To cancel select the cancel button",
        Text = text,
        Icon = new TaskDialogIcon(Icon),
        Buttons = new TaskDialogButtonCollection() { continueButton, cancelButton },
        Caption = "Data operations"
    };

    using Timer timer = new()
    {
        Enabled = true,
        Interval = 100
    };

    timer.Tick += (_, _) =>
    {
        remaining -= 1;

        if (remaining != 0) return;
        timer.Enabled = false;
        if (continueButton.BoundPage is not null)
        {
            continueButton.PerformClick();
        }
    };

    TaskDialogButton result = TaskDialog.ShowDialog(owner, page);

    ContinueOperation?.Invoke(result == continueButton);

}