Capturing GroupShapes as single Image

Please see attached powerpoint. In it all the shapes are ungrouped.
But I want to add them to a group and then use the method: slide.GetThumbnail(new object[] { shape }, imgSize, boundingRect) to capture that image as a single image. But I only want to do that to unGrouped Shapes, not TextFrames, etc.
Please tell how I can do that?


You don’t need to group them, just create a collection object and add whatever shape you want to draw.

For example, in the code below, I add the shape in a list provided the shape does not have any textframe or if it has then it is empty.

Presentation pres = new Presentation(@"D:\downloads\helium_101_training_presentationUnGrouped.ppt");
Slide sld = pres.GetSlideByPosition(1);

//add the shape in a list provided the
//shape does not have any textframe
//or if it has then it is empty.
ArrayList lst = new ArrayList();
foreach (Shape shp in sld.Shapes)
    if (shp.TextFrame == null)
        if (shp.TextFrame.Text == "")

//Create an image with the included shapes only
int slideWidth = pres.SlideSize.Width;
int slideHeight = pres.SlideSize.Height;
System.Drawing.Rectangle rect = new System.Drawing.Rectangle(1, 1, slideWidth, slideHeight);
Image img = sld.GetThumbnail(lst, 3.0, 3.0, rect);

//Save the image on disk

Also see the attached image generated by the above code.