public void NewArtboard()
{
if (SlideSelection == null || SlideSelection.Count != 1)
{
return;
}
var slide = SlideSelection[1];
Application.StartNewUndoEntry();
PowerPoint.Shape artboard = slide.Shapes.AddShape(Office.MsoAutoShapeType.msoShapeRectangle, 25, 10, 50, 60);
artboard.TextFrame.TextRange.InsertAfter("Artboard");
artboard.Fill.ForeColor.RGB = System.Drawing.Color.White.ToArgb();
artboard.Line.Visible = Office.MsoTriState.msoFalse;
artboard.Shadow.Type = Office.MsoShadowType.msoShadow25;
artboard.Shadow.Blur = 15;
artboard.Shadow.Transparency = 0.6f;
artboard.Shadow.Size = 100;
artboard.TextFrame.WordWrap = Office.MsoTriState.msoFalse;
artboard.TextEffect.FontSize = 18;
artboard.TextEffect.Alignment = Office.MsoTextEffectAlignment.msoTextEffectAlignmentCentered;
artboard.TextFrame.VerticalAnchor = Office.MsoVerticalAnchor.msoAnchorTop;
artboard.TextFrame.MarginBottom = 0;
artboard.TextFrame.MarginLeft = 0;
artboard.TextFrame.MarginRight = 0;
artboard.TextFrame.MarginTop = 76.8f;
artboard.TextFrame.TextRange.Font.Color.RGB = System.Drawing.Color.Black.ToArgb();
artboard.Name = "Artboard " + (artboard.Id - 1);
artboard.Select();
}