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It seems that the latest sources for gtk-sharp2 are no longer uploaded to mono-project.com. The mono project's Github seem to be very active though (see https://github.com/mono/gtk-sharp/tree/gtk-sharp-2-12-branch) I would advise updating to the latest version from there: https://github.com/mono/gtk-sharp/releases/tag/2.12.29
Seems like they're uploading to mono-project.com again: http://download.mono-project.com/sources/gtk-sharp212/ The latest appears to be 2.12.40 on there
2.12.42 is available
2.12.24 is now in Rawhide