public static string GetMD5Hash(string text)
{
    var md5 = MD5.Create();
    //another way to create and md5 object is new MD5CryptoServiceProvider();
    var stringBuilder = new StringBuilder();
    foreach (var aByte in md5.ComputeHash(GetBytes(text)))
    {
        stringBuilder.AppendFormat("{0:x2}", aByte);
    }
    return stringBuilder.ToString();
}



private static byte[] GetBytes(string text)
{
    return Encoding.UTF8.GetBytes(text);
}