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Change String into a Valid File Name

Not all possible characters are suitable for file names. For example path separators cannot be used for file names.

This changes any string into a valid file name by replacing the invalid characters with an underscore:

public static string GetValidFileName(string fileName)
  foreach (char c in Path.GetInvalidFileNameChars()) 
    fileName = fileName.Replace(c, '_'); 
  return fileName; 


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