using System;

public class Program

{

    public static void Main()

    {

        var value1 = getTLV(1, "Shawky");

        var value2 = getTLV(2, "310508283300003");

        var value3 = getTLV(3, "2022-06-22 - 0:00:00");

        var value4 = getTLV(4, "5060");

        var value5 = getTLV(5, "60");

        var b = System.Text.Encoding.UTF8.GetBytes(value1 + value2 + value3 + value4 + value5);

        var t = Convert.ToBase64String(b);

        Console.WriteLine(t);

    }

​

    private static string getTLV(int tag, string val){

        return "" + Convert.ToChar(tag) + Convert.ToChar(val.Length) + val;

    }

}