byte[]轉換為字串儲存，然後再轉回來

byte[] bytes = System.Text.Encoding.Default.GetBytes("fadfasfasdf");

string str = BitConverter.ToString(bytes);

string s2 = BitConverter.ToString(bytes); // 82-C8-EA-17

String[] tempAry = s2.Split("-");

byte[] decBytes2 = new byte[tempAry.Length];

for (int i = 0; i < tempAry.Length; i++)

decBytes2[i] = Convert.ToByte(tempAry[i], 16);

// decBytes2 same as bytes

string s3 = Convert.ToBase64String(bytes); // gsjqFw==

byte[] decByte3 = Convert.FromBase64String(s3);