using System.Text.RegularExpressions;
public static void Main()
var inputstring = "Hello World <script>alert('Hallo!');</script>";
Console.Write("Böser Text: ");
Console.WriteLine(inputstring);
var s = HttpUtility.UrlEncode(inputstring);
Console.Write("UrlEncoded: ");
var str = Regex.Replace(inputstring, "[^a-zA-Z0-9 ]", "");
Console.Write("Nach Regex: ");