Convert string to uri in its simple form .NET

I want to convert for example:

Aión to URI string, so using System.Uri.EscapeDataString this translates as Ai%C开发者_JS百科3%B3n but I expect Ai%F3n

How can I translate characters, the way I want?

I'm using a regular winform application not a ASP page

Server.HTMLEncode

This would give you

"Aión"

Thanks to @Paul McCowat and the last asnwer on that link I came up with a function that does what I want:

public static string ConvertToUri(string uri_string)
        {
            StringBuilder Encoded = new StringBuilder();
            foreach (char Ch in uri_string)
            {
                if (Uri.EscapeUriString(Ch.ToString()) != Ch.ToString())
                {
                    Encoded.Append("%");
                    Encoded.AppendFormat("{0:x2}", Encoding.Unicode.GetBytes(Ch.ToString())[0]);
                }
                else
                {
                    Encoded.Append(Ch);
                }
            }
            return Encoded.ToString();
        }