Trying to reproject British National Grid (OSGB36) coordinates to Lat Long (WGS1984) produces wrong coordinates. Trying to convert from WGS1984 to OSGB36 produces value '-1.#IND'. This issue was reported several years ago but apparently was never fixed or is broken again.
http://dotspatial.codeplex.com/discussions/242230
Comments: ** Comment from web user: HUrmenyi **
http://dotspatial.codeplex.com/discussions/242230
Comments: ** Comment from web user: HUrmenyi **
See also issue 63501