Public Sub InsertPoint( _
   ByVal i As Integer, _
   ByVal p As Point _
) 

public void InsertPoint( 
   int i,
   Point p
)

Parameters

i

the zero-based index of the new point; if less than zero this does nothing; if greater than the number of points it adds the point at the end

p

the new point, which should not have infinite coordinate values

Reference

Route Class
Route Members