Simple way to encrypt and decrypt querystring

Encrypt code:

string data="query string";
     string encodedData = String.Empty;
       try
       {
           byte[] data_byte = Encoding.UTF8.GetBytes(data);
           encodedData = HttpUtility.UrlEncode(Convert.ToBase64String(data_byte));
        }
        catch (Exception exception)
        {
           //Log exception
        }
        return encodedData;

Decrypt code

string data="encoded data";
        string decodedData = String.Empty;
        try
        {
             byte[] data_byte = Convert.FromBase64String(HttpUtiltity.UrlDecode(data));
             decodedData = Encoding.UTF8.GetString(data_byte);
        }
        catch (Exception exception)
        {
             //Log exception
         }
         return decodedData;