Extension method

class Program
{
    static void Main(string[] args)
    {
        Console.WriteLine(StringExtension.UrlEncodeMethod("中文"));
        Console.WriteLine("中文".UrlEncode());
        Console.Read();
    }
}


static class StringExtension
{
    public static string UrlEncodeMethod(string s)
    {
        return HttpUtility.UrlEncode(s);
    }

    public static string UrlEncode(this string s)
    {
        return HttpUtility.UrlEncode(s);
    }
}