Here we'll discuss why it happens and how it can be avoided. Browse to a profile file containing the connection information, specific to selected provider. 2.1.2. Not all invalid characters for directory and file names are interpreted as unacceptable by the Combine method, because you can use these characters for search wildcard characters. sourceDirName or destDirName is null. You might want to try using Path.Combine to ensure file paths are correct: string rootDirectory = Path.Combine(@"E:\Inetpub\wwwroot\Apps\Uploads\",EmployeeID.Value); string[] fileEntries = Directory.GetFiles(rootDirectory); foreach (string fileName in fileEntries) mMailMessage.Attachments.Add(new Attachment(Path.Combine(rootDirectory,fileName))); The full set of invalid characters can vary by file system. Test-Path - Illegal characters in path when using a variable Hot Network Questions Is calling a character a "lunatic" or "crazy" ableist when it is in reference to their erratic behavior? For example, on Windows-based desktop platforms, invalid path characters might include ASCII/Unicode characters 1 through 31, as well as quote ("), less than (<), greater than (>), pipe (|), backspace (\b), null (\0) and tab (\t). destDirName String. The same applies to other providers. So you'll need to iterate the directories you want to search, then call Directory.GetFiles(directory, "test*.doc") on each directory.. How to write that code depends on how robust you want it to be and what assumptions you want to make (e.g. You can query for invalid characters with the GetInvalidPathChars() method. We can't help you find the file of course, good luck digging through 1000s of them. The .zip archive itself contains a file that uses a reserved character. For example, while Path.Combine("c:\\", "*.txt") might be invalid if you were to create a file … Manually specify address. Seeing the message "Illegal characters in path" can be frustrating, especially when it doesn't actually prevent a link from being added to a page. Applies to Not exactly a complete mystery when the word "cygwin" appears in the question, Unix name rules are different from Windows. The second parameter, the search pattern, works only for filenames. For example, on Windows-based desktop platforms, invalid path characters might include ASCII/Unicode characters 1 through 31, as well as quote ("), less than (<), greater than (>), pipe (|), backspace (\b), null (\0) and tab (\t). For example, for Attachmate Reflection, one may choose a rd5x/rd3x file, corresponding to a TN5250/TN3270 profile file. ArgumentNullException. The path of the file or directory to move. Illegal characters in path while converting HTML and chat into pdf file An unhandled exception of type 'system.argumentexception' occurred in mscorlib.dll additional information: illegal characters in path. 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