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My C# WinForms solution has two projects. A DLL which is the main project I'm working on, and an executable WinForms I call "Sandbox" so that I can compile/run/debug the DLL easily in one go. I'm working in .Net 4.0 for both projects. Everything was working fine until I added some seemingly innocent code, and a reference to System.Web in the DLL. Now my Sandbox project can't see the namespace of the DLL project. I didn't change anything which I believe should have affected this. If I delete the project reference to the DLL from the Sandbox references and re-add it, then the red underlines all disappear and the colour coding comes back for all my classes etc; but as as soon as I try to build the solution, the whole thing falls apart again. When I right-click the DLL project in the Sandbox's references and view in object browser, I can see the namespace and all the stuff in there. I have a feeling this might be some sort of bug? Is this some sort of VS2010 bug? I had this same issue a few months ago and I could only fix it at the time by making a whole new project and re-importing my files. This time, however, I have a bajillion files and will only do that as a last resort! Edit: After panickedly going through and undoing all my changes, trying to find what caused the problems, it seems to be this line: string url = "http://maps.google.com?q=" + HttpUtility.UrlEncode(address); If I comment out this line, then I get no namespace errors and the project builds fine. I can't see anything wrong with this line though.

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