Joining Visual Studio should work fine. What exactly happened?
The reason for the problem 1 that you described is because you did not make your class public or you were unable to add Fiddler.RequiredVersionAttribute to your assembly.
Inside Fiddler, you should also enter the following in the QuickExec field below the list of sessions:
prefs set fiddler.debug.extensions.verbose True
... and restart Fiddler. You can find additional debugging information on the LOG tab.
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