C#

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static void Main(string[] args)
       {
           Console.WriteLine("");

           // Define const Key this should be private secret key  stored in some safe place
           string key = "401b09eab3c013d4ca54922bb802bec8fd5318192b0a75f201d8b372742
           9090fb337591abd3e44453b954555b7a0812e1081c39b740293f765eae731f5a65ed1";

           // Create Security key  using private key above:
           // not that latest version of JWT using Microsoft namespace instead of System
           var securityKey = new Microsoft
               .IdentityModel.Tokens.SymmetricSecurityKey(Encoding.UTF8.GetBytes(key));

           // Also note that securityKey length should be >256b
           // so you have to make sure that your private key has a proper length
           //
           var credentials = new Microsoft.IdentityModel.Tokens.SigningCredentials
                             (securityKey, SecurityAlgorithms.HmacSha256Signature);

           //  Finally create a Token
           var header = new JwtHeader(credentials);

           //Some PayLoad that contain information about the  customer
           var payload = new JwtPayload
           {
               { "some ", "hello "},
               { "scope", "http://dummy.com/"},
           };

           //
           var secToken = new JwtSecurityToken(header, payload);
           var handler = new JwtSecurityTokenHandler();

           // Token to String so you can use it in your client
           var tokenString = handler.WriteToken(secToken);

           Console.WriteLine(tokenString);
           Console.WriteLine("Consume Token");


           // And finally when  you received token from client
           // you can  either validate it or try to  read
           var token = handler.ReadJwtToken(tokenString);

           Console.WriteLine(token.Payload.First().Value);

           Console.ReadLine();
       }

public static bool TryParse(string s,out Complex z)
{
     /* Here following formats should be accepted
        z = a+bi
        z = a+bj
        z = (a,b)
        where type of a and b is double
        Decimal point depends on CultureInfo  
        fe for US and UK it is a dot 
        in CE (Central Europe) where I live it is comma
        */
}

// necessary depending on use
// using NestedClassExample1;

OuterClass1 oc1 = new OuterClass1();

var cat1 = oc1.AddSomething(new Cat("cat1", "meow"));
var cat2 = oc1.AddSomething(new Cat("cat2", "hiss"));
var dog1 = oc1.AddSomething(new Dog("dog1"));

var cat1instance = oc1.GetSomething("cat1");

using System;
using System.Collections.Generic;
using System.Linq;

namespace NestedClassExample1
{
    public interface ISomething1
    {
        string Name { get; }
    }

    public class OuterClass1
    {
        private List<ISomething1> Somethings = new List<ISomething1>();

        internal ISomething1 AddSomething(ISomething1 newsomething)
        {
            Somethings.Add(newsomething);
            return newsomething;
        }

        internal ISomething1 GetSomething(string name)
        {
            return Somethings.FirstOrDefault(smtng => smtng.Name == name);
        }
    }

    public class Cat : ISomething1
    {
        public Cat(string name, string sound = "")
        {
            Name = name;
            CatSound = sound;
        }
        public string Name { get; }
        public string CatSound { set; get; }
    }

    public class Dog : ISomething1
    {
        public Dog(string name, string sound = "")
        {
            Name = name;
            DogSound = sound;
        }

        public string Name { get; }
        public string DogSound { set; get; }
    }

    public class Tiger : ISomething1
    {
        public Tiger(string name) { Name = name; }
        public string Name { get; }
    }
}