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public string EscapeXmlString(string URL)
{
//Avoid errors if the string is already escaped for xml use
    for (int i = 0; i < URL.Length-1; i++)
    {
        if (URL[i] == ‘&’)
        {
            switch (URL[i + 1])
            {
                case ‘a’:
                    if ((i + 5 < URL.Length) && (URL.Substring(i, 6) == “&apos;”))
                    {
                        continue;
                    }
                    else
                    {
                        if ((i + 4 < URL.Length) && (URL.Substring(i, 5) == “&amp;”))
                        {
                            continue;
                        }
                        else
                        {
                            //Escape it
                            URL = URL.Insert(i+1, “amp;”);
                        }
                    }
                break;
                case ‘q’:
                    if ((i + 5 < URL.Length) && (URL.Substring(i, 6) == “&quot;”))
                    {
                        continue;
                    }
                    else
                    {
                        //Escape it
                        URL = URL.Insert(i+1, “amp;”);
                    }
                break;
                case ‘g’:
                    if ((i + 3 < URL.Length) && (URL.Substring(i, 4) == “&gt;”))
                    {
                        continue;
                    }
                    else
                    {
                        //Escape it
                        URL = URL.Insert(i+1, “amp;”);
                    }
                break;
                case ‘l’:
                    if ((i + 3 < URL.Length) && (URL.Substring(i, 4) == “&lt;”))
                    {
                        continue;
                    }
                    else
                    {
                        //Escape it
                        URL = URL.Insert(i+1, “amp;”);
                    }
                break;
                default://Escape it
                    URL = URL.Insert(i+1, “amp;”);
                    break;
            }
        }
    }
 
    URL = URL.Replace(“‘”, “&apos;”);
    URL = URL.Replace(“\”“, “&quot;”);
    URL = URL.Replace(“>”, “&gt;”);
    URL = URL.Replace(“<”, “&lt;”);
 
    return URL;
}