should the validate page PARAMLIST be URL encoded?

[binary1230]

in the sample code here:
https://github.com/PayTrace/samples/blob/master/SecureCheckout/DotNet/CSharp/SecureCheckout/Default.aspx.cs#L41

It does:
parameter_list = parameter_list + Parameters;

should that be URL encoded?
parameter_list = parameter_list + HttpUtility.UrlEncode(Parameters);

this sample code just happens to work because it doesn't have any special characters in it, it could potentially break if that changed. The VB code in the docs does URL encoding like this