Work with Shapes in PowerPoint Slides in C#

add-connector.cs

// Instantiate a Presentation object that represents a presentation file
using (Presentation pres = new Presentation("presentation.pptx"))
{
    // Accessing shapes collection for selected slide
    IShapeCollection shapes = pres.Slides[0].Shapes;

    // Add autoshape Ellipse
    IAutoShape ellipse = shapes.AddAutoShape(ShapeType.Ellipse, 0, 100, 100, 100);

    // Add autoshape Rectangle
    IAutoShape rectangle = shapes.AddAutoShape(ShapeType.Rectangle, 100, 300, 100, 100);

    // Adding connector shape to slide shape collection
    IConnector connector = shapes.AddConnector(ShapeType.BentConnector2, 0, 0, 10, 10);

    // Joining Shapes to connectors
    connector.StartShapeConnectedTo = ellipse;
    connector.EndShapeConnectedTo = rectangle;

    // Call reroute to set the automatic shortest path between shapes
    connector.Reroute();

    // Save presentation
    pres.Save("presentation.pptx", Export.SaveFormat.Pptx);
}

add-shape.cs

// Instantiate a Presentation object that represents a presentation file
using (Presentation pres = new Presentation("presentation.pptx"))
{
    // Get the first slide
    ISlide sld = pres.Slides[0];

    // Add autoshape of ellipse type
    sld.Shapes.AddAutoShape(ShapeType.Ellipse, 50, 150, 150, 50);

    // Save presentation
    pres.Save("presentation.pptx", Export.SaveFormat.Pptx);
}

clone-shape.cs

// Instantiate a Presentation object that represents a presentation file
using (Presentation pres = new Presentation("presentation.pptx"))
{
    // Obtain shape collection from source slide
    IShapeCollection sourceShapes = pres.Slides[0].Shapes;
    ILayoutSlide blankLayout = pres.Masters[0].LayoutSlides.GetByType(SlideLayoutType.Blank);
    ISlide destSlide = pres.Slides.AddEmptySlide(blankLayout);
    
    // Get shape collection from destination slide
    IShapeCollection destShapes = destSlide.Shapes;
    destShapes.AddClone(sourceShapes[1], 50, 150 + sourceShapes[0].Height);
    destShapes.AddClone(sourceShapes[2]);
    
    // Clone shape
    destShapes.InsertClone(0, sourceShapes[0], 50, 150);

    // Save presentation
    pres.Save("presentation.pptx", Export.SaveFormat.Pptx);
}

remove-shape.cs

// Instantiate a Presentation object that represents a presentation file
using (Presentation pres = new Presentation("presentation.pptx"))
{
    // Get the first slide
    ISlide sld = pres.Slides[0];

    // Add autoshape of rectangle type
    IShape shp1 = sld.Shapes.AddAutoShape(ShapeType.Rectangle, 50, 40, 150, 50);
    IShape shp2 = sld.Shapes.AddAutoShape(ShapeType.Moon, 160, 40, 150, 50);
    
    String alttext = "User Defined";
    int iCount = sld.Shapes.Count;
    for (int i = 0; i < iCount; i++)
    {
        // Retrieve shape
        AutoShape ashp = (AutoShape)sld.Shapes[0];
        if (String.Compare(ashp.AlternativeText, alttext, StringComparison.Ordinal) == 0)
        {
            // Remove shape
            sld.Shapes.Remove(ashp);
        }
    }

    // Save presentation
    pres.Save("presentation.pptx", Export.SaveFormat.Pptx);
}