How To Smooth-out the Edges Of the Shapes In a Diagram

You can use the Diagram.Model.RenderingStyle.SmoothingMode property to smooth-out the edges, lines and curves of the shapes in a diagram.

this.diagram1.Model.RenderingStyle.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
Me.diagram1.Model.RenderingStyle.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality