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Compiler Error CS2021 

Error Message

File name 'file' is too long or invalid

All file names passed to the C# compiler must be no longer than _MAX_PATH (defined in a Windows header file). the compiler will give this error in the following situations:

  • A file name (including the path) is longer than _MAX_PATH.

  • The file name contains invalid characters.

  • The file name contains wildcards where wildcards are not allowed (such as in resource file names).

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