Recently I surfaced a problem where, one of my friend had a tough time in getting rid of an assembly reference error. Despite adding reference to the assembly, while referencing it in code, it was spitting out the “The type or namespace name ‘ASSEMBLYNAME’ could not be found” error. This was a migration project and owing to the above error, it was throwing another 100 errors. We tried adding reference to the assembly in other projects and it was not even resolving the namespace while typing out in the using section. Upon further digging into the error warnings, it indicated something to do with the .NET
Framework targeted i.e. 4.0. My suspicion grew since the target
framework was 4.0 and the assembly should be able to be recognized. Then, when we checked “Project – “<APPNAME> Properties…”, the issue was with the default target
framework which is “.NET
Framework 4 Client Profile” By default, Visual Studio 2010 creates Windows Forms App/WPF Apps with the Target
Framework set to .NET
Framework 4 Client Profile. This is to minimize the
framework size required to be bundled along with the app. Client Profile is new feature since .NET 3.5 SP1 that allows users to package a minified version of .NET
Framework that doesn’t include stuff such as ASP.NET, Server programming assemblies and few other assemblies which are typically never used in the Desktop Applications. Since the .NET
Framework client profile is a minified version, it doesn’t contain all the assemblies related to Web services and other deprecated assemblies. However, this application is a migration app and needed some of the references from Services and hence couldn’t run. Once, we changed the Target
Framework to .NET
Framework 4 instead of the default client profile, the application compiled. Here is link to a very nice article that explains the features of .NET
Framework 4 client Profile, the assemblies supported by default etc., http://blogs.msdn.com/b/jgoldb/archive/2010/04/12/what-s-new-in-net-framework-4-client-profile-rtm.aspx Cheers !!
