simple token generator c#

token.cs

//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;
using System.Text;
 using System.Collections;

namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {
            //Your code goes here
            Console.WriteLine(token());
            
           
            
        }
        
        public static string token(int laenge = 10){
         List<string> Alphabet = new List<string>() {"A","B","C","D","E","F","G","H","I","J","K","L","M","N","O","P","Q","R","S","T","U","V","W","X","Y","Z",
                                                     "a", "b", "c", "d", "e", "f", "g","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w","y", "z", "0","1","2","3","4","5","6","7","8","9"};
            
            var random = new Random();

             var sb = new StringBuilder();
            foreach (var i in Enumerable.Range(0, 10))
                {
                    sb.Append(Alphabet[random.Next(0, Alphabet.Count)]);
                }
            
         return sb.ToString();
        }
    }
}