How to parse data from the response from webservice

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ASP.NET

Hello friend , i want to create custom type from the response stream . Let me clear first.
from mstrAPIURL=http://www.example.com?e={0}(arbitary url) i have to fetch data. for this i have used
following code
string str = string.Empty;
var client = new WebClient();
StreamData = client.OpenRead(mstrAPIURL);

if (StreamData != null)
{
var reader = new StreamReader(StreamData);
str = reader.ReadLine();


}
in the str variable m getting response resultCode=7000&resultDesc=SucessFull
and the response format is fixed. i want to can i create class with properties resultCode and resultDesc. i don want to do string manipulation