Where did this sample come from?
Your subject line says C3D2012, but the message references C3D2013. The 2013 API did away with the sub Namepscaes (Land, Road, Pipes, Survey), so it looks like this example was intended for C3D 2012 but you are attempting to build it for 2013. If this is the case, you need to reference accoremgd.dll and remove the .Land from the usings statements.