using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

        Console.WriteLine(EscapeUri("http://Hello;World"));

        Console.WriteLine(EscapeUri("uri:mregen11:UA:samplehost"));

    }

    public static string EscapeUri(string uri)

    {

        if (!String.IsNullOrWhiteSpace(uri))

        {

            return Uri.EscapeDataString(uri);

            var builder = new UriBuilder(uri/*.Replace(";", "%3b")*/);  

            return builder.Uri.AbsoluteUri;

        }

        return null;

    }

}