System.Net.Http: missing from namespace? (using .net 4.5)

Question

TL; DR: I'm new to this language and have no idea what I'm doing

here is my class so far:

using System; using System.Collections.Generic; using System.Net.Http; using System.Web; using System.Net; using System.IO;  public class MyClass     {         private const string URL = "https://sub.domain.com/objects.json?api_key=123";         private const string data = @"{""object"":{""name"":""Title""}}";          public static void CreateObject()         {             HttpWebRequest request = (HttpWebRequest)WebRequest.Create(URL);             request.Method = "POST";             request.ContentType = "application/json";             request.ContentLength = data.Length;             StreamWriter requestWriter = new StreamWriter(request.GetRequestStream(), System.Text.Encoding.ASCII);             requestWriter.Write(data);             requestWriter.Close();              try             {                 // get the response                 WebResponse webResponse = request.GetResponse();                 Stream webStream = webResponse.GetResponseStream();                 StreamReader responseReader = new StreamReader(webStream);                 string response = responseReader.ReadToEnd();                 responseReader.Close();             }             catch (WebException we)             {                 string webExceptionMessage = we.Message;             }             catch (Exception ex)             {                 // no need to do anything special here....             }         }          static void Main(string[] args)         {             MyClass.CreateObject();         } } 

when I do csc filename.cs, I get the following error:

The type or namespace name 'Http' does not exist in the namespace 'System.Net' (are you missing an assembly reference?)

Answer 1

HttpClient lives in the System.Net.Http namespace.

You'll need to add:

using System.Net.Http; 

And make sure you are referencing System.Net.Http.dll in .NET 4.5.

---

The code posted doesn't appear to do anything with webClient. Is there something wrong with the code that is actually compiling using HttpWebRequest?

---

Update

To open the Add Reference dialog right-click on your project in Solution Explorer and select Add Reference.... It should look something like: