To Remove Illegal Filename Characters in C# and VB.NET you can use the following snippet.

Sample C#

public static string RemoveIllegalFileNameChars(string input, string replacement="")
	var regexSearch = new string(Path.GetInvalidFileNameChars()) + new string(Path.GetInvalidPathChars());
	var r = new Regex(string.Format("[{0}]", Regex.Escape(regexSearch)));
	return r.Replace(input, replacement);

Sample VB.NET

Public Shared Function RemoveIllegalFileNameChars(input As String, Optional replacement As String = "") As String
	Dim regexSearch = New String(Path.GetInvalidFileNameChars()) & New String(Path.GetInvalidPathChars())
	Dim r = New Regex(String.Format("[{0}]", Regex.Escape(regexSearch)))
	Return r.Replace(input, replacement)
End Function

4 thought on “How to Remove Illegal Filename Characters in C# and VB.NET”

Leave a Reply