using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine(EncodeString("ptml_service"));

    }

        public static String EncodeString(String input)

        {

​

            byte[] data = null;

            String base64 = null;

            try

            {

​

                data = System.Text.Encoding.UTF8.GetBytes(input);

            }

            catch (Exception ex)

            {

                // TODO Auto-generated catch block

​

            }

            base64 = System.Convert.ToBase64String(data);

            base64 = 'B' + base64;

            base64 = base64 + '2';

​

            //String[] a = base64.Split('=');

            //String output = a[0] + a[1];

            try

            {

                data = System.Text.Encoding.UTF8.GetBytes(base64);

            }

            catch (Exception e)

            {

                // TODO Auto-generated catch block

            }

            base64 = System.Convert.ToBase64String(data);

            return base64;

​

        }

}