webrequest.cs

public string WebGetString(Uri endpoint, string path, params WebParam[] queryParams)
        {
            System.Net.WebClient client = new System.Net.WebClient();
            StringBuilder relativePath = new StringBuilder(path);
            var filteredParams = (from p in queryParams where p.Value != null select p).ToArray();
            if (filteredParams != null && filteredParams.Length > 0)
            {
                relativePath.Append("?");
                foreach (var param in filteredParams)
                {
                    var escapedValue = System.Net.WebUtility.UrlEncode(param.Value);
                    relativePath.AppendFormat("{0}={1}", param.Key, escapedValue);
                    relativePath.Append("&");
                }
            }
            var uri = new Uri(endpoint, relativePath.ToString());
            var responseString = client.DownloadString(uri);
            return responseString;
        }