using System;

using System.Text;

namespace Rextester{

    public class Program{

        public static void Main(string[] args){

            // string -> UTF8 bytes -> base 64

            string rawRoute = "AgentEventFilter/{ Agentgroup:\" 🙃 MyAgentGroup 😬\"}";

            string base64Content = Convert.ToBase64String(Encoding.UTF8.GetBytes(rawRoute)); 

​

            System.Console.WriteLine(System.Environment.NewLine);

            // base 64 -> bytes -> UTF8 string

            var byteArray=  Convert.FromBase64String(base64Content);

            var decoded=Encoding.UTF8.GetString(byteArray);

            System.Console.WriteLine(decoded);

        }

    }

}