We suggest creating a public/global object named Utils.
For VB.NET, it can be placed as a public member of the form/class for example as:
Dim GisUtils as a new XGIS_Utils.
For VB, it can be placed as a global variable, for example as:
Dim GisUtils as a new XGIS_Utils.
Then any member of IXGIS_Utils can be used in the form of GisUtils.Line2Point, etc.