using System;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        var tests = new List<string> {

            //"twitter.com/test",

            "https://twitter.com/test",

            "http://twitter.com/test",

            "https://twitter.com/test?hello=hello",

            //"handle",

            //"handle/handle"

        };

​

​

        foreach (var test in tests)

        {

            Console.WriteLine(string.Format("{0}: {1}", test, IsValidUri(test)));

        }

    }

    public static bool IsValidUri(string uri)

    {

        Uri myUri = new Uri(uri);

         Console.WriteLine(myUri.AbsolutePath);

        return Uri.IsWellFormedUriString(uri, UriKind.Absolute);

    }

}