windows background service to stored data in sql server

/ Create an HttpClient instance HttpClient client = new HttpClient();

client.BaseAddress = new Uri("http://localhost:8888/");

// Usage HttpResponseMessage response = client.GetAsync("api/importresults/1").Result;

if (response.IsSuccessStatusCode)

{ var dto = response.Content.ReadAsAsync().Result; }

else { Console.WriteLine("{0} ({1})",

(int)response.StatusCode, response.ReasonPhrase); }

Just use the HttpClient in ur application mate u will acheive this

Yes i have third party service called abc api.I need to call all that get method of their api and need to store in our database table

Do u want to call the Web API service from windows service ??