1、 System.Text.UnicodeEncoding converter = new System.Text.UnicodeEncoding();

         byte[] inputBytes =converter.GetBytes(inputString);
         string inputString = converter.GetString(inputBytes);
2、 string inputString = System.Convert.ToBase64String(inputBytes);
         byte[] inputBytes = System.Convert.FromBase64String(inputString);

1、 System.Text.UnicodeEncoding converter = new System.Text.UnicodeEncoding();
         byte[] inputBytes =converter.GetBytes(inputString);
         string inputString = converter.GetString(inputBytes);
2、 string inputString = System.Convert.ToBase64String(inputBytes);
         byte[] inputBytes = System.Convert.FromBase64String(inputString);