WeldVertices in RinoCommon?

Hi,

Is there some function in RhinoCommon like the WeldVertices command?

http://docs.mcneel.com/rhino/5/help/en-us/commands/weld.htm

thanks.

EDIT: Thought I had too look into the vertices but its weld:

Dim ad As Geometry.Mesh = m.Mesh
ad.Weld(RhinoMath.ToRadians(90))