using System;

using System.Linq;

using System.Net;

using System.Web;

​

public class Program

{

    public static void Main()

    {

        var diffs =

            from i in Enumerable.Range(0, char.MaxValue + 1)

            let c = (char)i

            where !char.IsHighSurrogate(c)

            let diff = new {

                Original = c,

                UrlEncode = EncodedToUpper(WebUtility.UrlEncode(c.ToString())),

                EscapeDataString = EncodedToUpper(Uri.EscapeDataString(c.ToString())),

                EscapeUriString = EncodedToUpper(Uri.EscapeUriString(c.ToString())),

                //HttpUrlEncode = EncodedToUpper(HttpUtility.UrlEncode(c.ToString())), // Same as WebUtility.UrlEncode

                HttpUrlPathEncode = EncodedToUpper(HttpUtility.UrlPathEncode(c.ToString()))

            }

            where new[] { diff.EscapeDataString, diff.EscapeUriString, diff.HttpUrlPathEncode }.Any(s => s != diff.UrlEncode)

            select diff;

​

        Console.WriteLine("Original\tUrlEncode\tEscapeDataString\tEscapeUriString\tHttpUrlPathEncode");

        foreach (var diff in diffs)

            Console.WriteLine($"{diff.Original}\t{diff.UrlEncode}\t{diff.EscapeDataString}\t{diff.EscapeUriString}\t{diff.HttpUrlPathEncode}");

    }

    private static string EncodedToUpper(string s)

    {

        return s.Length > 1 ? s.ToUpperInvariant() : s;

    }

}