how to replace non ascii characters

Using regex
RegexReplace(File, '\xE2\x98\x8E', '') and the file are html files.

Am i doing this correctly?

using System;
using System.Text.RegularExpressions;

public object DoWork()
{
    int count = InValues.Length;

    // Ensure at least one parameter is passed
    if (count < 1)
    {
        string msg = ".NET Script Heater: minimum one input parameter expected!";
        if (TestMode)
        {
            return msg;
        }
        else
        {
            throw new ArgumentException(msg);
        }
    }

    // Get the input HTML content
    string inputText = (string)InValues[0].GetValue();

    // Remove all non-ASCII characters
    string cleanText = Regex.Replace(inputText, @"[^\u0000-\u007F]", "");

    // Return the cleaned text
    return cleanText;
}

its past on from html / file to multiple regex then this script. 
any pointers what i am doing wrong here... and where is the html input here (just so it sinks in)

omg im a plonker. put the system part in the advanced section...
Cheers
it works so far so good.