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?

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Update

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