Every time I try to build my project I get pop up messages as in the image. I am using TFS 2010. I tried deleting the dll's,unchecking read-only option for the dll's. But I still get this annoying pop-up for many of the dll's.The dll's are automatically checked out by the user who builds it first.How can I solve this problem? Please help
Are you talking about the DLL that are generated by the Visual Studio Solution ? If it's the case, it's a very bad idea to put them under source control, at least at the location where they are generated!
If you still want to store the DLL on the source control, create a "repository" folder somewhere and copy the generated files there, but don't put under source control every folder that are generated by Visual Studio (Bin, Obj, etc.)