hash

 private string createHash(string input)
        {
            MD5 md5 = MD5.Create();

            byte[] inputBytes = Encoding.ASCII.GetBytes(txtPwd.Text);
            byte[] hashBytes = md5.ComputeHash(inputBytes);

            StringBuilder sb = new StringBuilder();
            for (int i = 0; i < hashBytes.Length; ++i)
            {
                sb.Append(hashBytes[i].ToString("X2"));
            }

            return sb.ToString();
        }