using System;

using System.Text;

using System.Security.Cryptography;

public class Program

{

    public static void Main()

    {

        Console.WriteLine(GetMd5("appidESA_imeis869601036452873,869601036669997_timestamp1530179348_60eb46745ba9ce84582728aca7ed92dd"));

    }

​

    public static string GetMd5(string src)

    {

        StringBuilder  buffer = new StringBuilder();

        using (var md5 = MD5.Create())

        {

            var md5Bytes = md5.ComputeHash(Encoding.UTF8.GetBytes(src));

            for (var i = 0; i < md5Bytes.Length; i++)

            {

                var val = Convert.ToInt32(md5Bytes[i] & 0xff);

                if (val < 16)

                {

                    buffer.Append("0");

                }

                buffer.Append(string.Format("{0:X}", val));

            }

        }

​

        return buffer.ToString();

    }

}