help me out please

    var client = new RestClient("https://corona-virus-world-and-india-data.p.rapidapi.com/api");
    var request = new RestRequest(Method.GET);
    request.AddHeader("x-rapidapi-host", "corona-virus-world-and-india-data.p.rapidapi.com");
    request.AddHeader("x-rapidapi-key", "134f42773cmsheeb24d87d32a4e7p195a53jsn3d53f2699924");
    IRestResponse response = client.Execute(request);
    cart.DataSource = response.ToString();
    cart.DataBind();

i use this to add on gridview but it didn’t show any thing else