Crear un aspmenu por código

Menu m = new Menu();
XmlDataSource x = new XmlDataSource();
x.DataBind(); 

x.EnableCaching = false;
m.MaximumDynamicDisplayLevels = 4;

m.StaticDisplayLevels = 10;
m.DynamicHorizontalOffset = 1;

m.DynamicVerticalOffset=1;

string s = "" + "";
x.Data = s;
m.DataSource = x;
m.DataBind();
form1.Controls.Add(m);