Create and Customize PowerPoint Slideshows

using GemBox.Presentation;

class Program
{
    static void Main()
    {
        // If using the Professional version, put your serial key below.
        ComponentInfo.SetLicense("FREE-LIMITED-KEY");

        var presentation = new PresentationDocument();

        // Create first slide used in custom slideshows.
        var slide1 = presentation.Slides.AddNew(SlideLayoutType.Custom);

        // Create a text box.
        var textBox = slide1.Content.AddTextBox(ShapeGeometryType.RoundedRectangle, 2, 2, 12, 4, LengthUnit.Centimeter);

        // Set shape fill and outline format.
        textBox.Shape.Format.Fill.SetSolid(Color.FromName(ColorName.BlueViolet));
        textBox.Shape.Format.Outline.Fill.SetSolid(Color.FromName(ColorName.Violet));

        // Create a paragraph with single run element.
        TextRun run = textBox.AddParagraph().AddRun("Shows how to create and customize slide shows using GemBox.Presentation API.");
        run.Format.Fill.SetSolid(Color.FromName(ColorName.White));
        run.Format.Bold = true;

        // Create other two slides used in custom slideshows.
        var slide2 = presentation.Slides.AddNew(SlideLayoutType.Custom);
        var slide3 = presentation.Slides.AddNew(SlideLayoutType.Custom);

        // Get presentation slide show settings.
        var settings = presentation.SlideShow;

        // Create first custom slideshow.
        var slideShow1 = settings.CustomShows.AddNew("CustomShow1");
        slideShow1.Slides.Add(slide1);
        slideShow1.Slides.Add(slide2);
        slideShow1.Slides.Add(slide3);

        // Create first custom slideshow.
        var slideShow2 = settings.CustomShows.AddNew("CustomShow2");
        slideShow2.Slides.Add(slide3);
        slideShow2.Slides.Add(slide2);
        slideShow2.Slides.Add(slide1);

        // Show the slides from the first custom show.
        settings.ShowCustomShowSlides("CustomShow1");

        // Slides should be manually advanced when presenting.
        settings.AdvanceMode = SlideShowAdvanceMode.Manually;

        // Slide show should loop at the end.
        settings.LoopContinuously = true;

        // Slides should be browsed at a kiosk (full screen).
        settings.ShowType = SlideShowType.Kiosk;

        presentation.Save("Slide Show.pptx");
    }
}