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The Daily Insight

What is path C#?

Author

Sarah Oconnor

Updated on April 30, 2026

C# tutorial is a comprehensive tutorial on C# language. The Path is located in the System.IO namespace. With the Path class, we can easily figure out the root path, the directory name of the file, its extension or create a random file name.

What does illegal characters in path mean?

Solution 1 The “Illegal characters” exception means that the file path string you are passing to ReadXml is wrong: it is not a valid path. It may contain ‘?’ , or ‘:’ in the wrong place, or ‘*’ for example. You need to look at the value, check what it is, and work out where the illegal character(s) are coming from.

Does slash direction matter?

Windows uses backslashes for paths, while everything else seems to use forward slashes. Modern software tries to automatically correct you when you type the wrong type of slash, so it doesn’t matter which type of slash you use most of the time.