ASP.net QueryResult to Dataset

I am using a query to pull data from Salesforce - which works well, but I want put the result into a dataset - below is what i am using - how can i put the query result directly into a dataset

Thanks

            SforceService queryservice = null;
            queryservice = new SforceService();
            queryservice.SessionHeaderValue = new SessionHeader();
            queryservice.SessionHeaderValue.sessionId = loginresult["sessionid"];

            queryservice.Url = loginresult["instance_url"];

            QueryResult qr = new QueryResult();

            string queryString = "";

            qr = queryservice.query(queryString);

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