// MDS
var settings = new Microsoft.Msagl.Layout.MDS.MdsLayoutSettings();
settings.EdgeRoutingSettings = new Microsoft.Msagl.Core.Routing.EdgeRoutingSettings();
switch (li)
{
    case 3:
        settings.EdgeRoutingSettings.EdgeRoutingMode = 
            Microsoft.Msagl.Core.Routing.EdgeRoutingMode.Spline;
        break;

    case 4:
        settings.EdgeRoutingSettings.EdgeRoutingMode =
            Microsoft.Msagl.Core.Routing.EdgeRoutingMode.Rectilinear;
        settings.RemoveOverlaps = true;
        settings.NodeSeparation = 1;
        settings.EdgeRoutingSettings.Padding = 0.1;
        settings.EdgeRoutingSettings.PolylinePadding = 0.1  ;

        break;
}
return settings;