//--- COMMENT SHAPE DRAW ---
// Create a new shape
Aspose.Cells.Drawing.Shape commentShape = xlWorkSheet.Shapes.AddAutoShape(Aspose.Cells.Drawing.AutoShapeType.RoundedRectangle, 0, 0, 0, 0, 0, 0);
commentShape.Y = 200;…...shape fill transparency //commentShape.Fill.Transparency = 1.0F;...border transparency //commentShape.LineFormat.Transparency = 1.0F;...