A few things to try. First, kill your output directories (by this, I mean locate your BIN directories and delete the DLL's and EXE's for your project, both Debug and Release). If things continue to give you problems with 'cannot replace' or 'cannot write' you will need to also remove these DLL's from your GAC (for GAC info: http://www.codeproject.com/dotnet/DemystifyGAC.asp)

Some other things:
Rebuild (versus Build) your assembly. This forces all sub-assemblies to be rebuilt from scratch.

Try setting your Copy Local (under Properties for each Reference) to True (if they are already True, try setting them to False, rebuild (it will fail) and then set True and rebuild.) If this does not work, try removing all of your references and add them back to the project.

Finally, if still No Joy, close all of your sub-assemblies, create a brand new solution, and then Add Existing to recreate the entire package.

These are terrible problems to get past , so be prepared to recreate things from scratch - make SURE you save a copy of your code somewhere safe.

Happy Coding!

Ned

Is it Fine if I put a new folder in the Bin...ie Project-->Properties-->Configuration-->Debug-->Output Directory....there i insert a new folder..will my above problem be resolved..tell me