Why Can't Visual Studio Find My Type or Namespace: A '.NET Framework' Version Solution?

Visual Studio cannot find the problem of the type or name space: the solution revealed the secret

Even if you carefully check the references, the USING statement and code, you may still encounter a headache when you build a Visual Studio C# project. This problem has plagued many developers.

After trying numerous failure elimination steps, the solution was finally found: the wrong configuration of the project target framework version. To solve this problem, please change the target framework version of the project (here for PRJFORM) from the ".NET Framework 4 client configuration file" to ".NET Framework 4".

This seemingly small change solves the problem, enabling your project to be successfully constructed. This proves the complexity of software development, and such subtle configuration changes can cause such confusing errors.

Remember, the art of debugging is not only to find the root cause, but also to identify those solutions that may not be obvious.

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