How to bind response to GridView using C# in ASP.Net

I am usign below code it works find the problem is its only binding column name in gridview and return values are not binding please advice

  string page = "https://api.postcodes.io/postcodes/L33AN";

        HttpWebRequest request = (HttpWebRequest)WebRequest.Create(page);

        //&tracking_number=" + txtttnumber.Text + "&courier=" + ddlcourier.SelectedValue

        HttpWebResponse response = (HttpWebResponse)request.GetResponse();

        if (response.StatusCode == HttpStatusCode.OK)
        {
            Stream receiveStream = response.GetResponseStream();
            StreamReader readStream = null;

            if (response.CharacterSet == null)
                readStream = new StreamReader(receiveStream);
            else
                readStream = new StreamReader(receiveStream, Encoding.GetEncoding(response.CharacterSet));
            //  List<string> list = new List<string>();
            //Convert JSON object into String
            string data = readStream.ReadToEnd();
            //Convert JSON object into Dictionary
            Dictionary<string, object> dict = new JavaScriptSerializer().Deserialize<Dictionary<string, object>>(data);


            //Convert into variable
            var GridData = dict["result"];

            GridView1.DataSource = GridData;
            GridView1.DataBind();





        }