Finding intersection point of two lines on "extending the lines" till they intersect

Hi All,

Could any one please direct me on finding an intersection point of two polyline objects by extending them till they intersect, using ArcObjects (its not 3D). The two input polylines initially do not intersect. Need to identify the point where they intersect when their ToPoint 's are extended.

Thanks in advance!

With Regards,
Vara Prasad.