Need to PostAsync with header and content c#

[Ijaazi]

I need to postAsync with header and content together. In order to get access to a website through Console Application in c#. I have my headers as an HttpHeader object with variable name header and my content named newContent as a string object with token, return, email, and password. Now what I want to do is add newContent to header and then use postAsync(url, header+content) to make my post request.

Code:

public async static void DownloadPage(string url)
{
CookieContainer cookies = new CookieContainer();
HttpClientHandler handler = new HttpClientHandler();
handler.CookieContainer = cookies;

using (HttpClient client = new HttpClient(handler))
{
using (HttpResponseMessage response = client.GetAsync(url).Result)
{
//statusCode
CheckStatusCode(response);
//header
HttpHeaders headers = response.Headers;
//content
HttpContent content = response.Content;
//getToken&createCollection
string newcontent = CreateCollection(content);

using(HttpResponseMessage response2 = client.PostAsync(url,))

}

}
}

public static string GenerateQueryString(NameValueCollection collection)
{
var array = (from key in collection.AllKeys
from value in collection.GetValues(key)
select string.Format("{0}={1}", WebUtility.UrlEncode(key), WebUtility.UrlEncode(value))).ToArray();
return string.Join("&", array);
}


public static void CheckStatusCode(HttpResponseMessage response)
{
if (response.StatusCode != HttpStatusCode.OK)
throw new Exception(String.Format(
"Server error (HTTP {0}: {1}).",
response.StatusCode,
response.ReasonPhrase));
else
Console.WriteLine("200");
}
public static string CreateCollection(HttpContent content)
{
var myContent = content.ReadAsStringAsync().Result;
HtmlNode.ElementsFlags.Remove("form");
string html = myContent;
var doc = new HtmlAgilityPack.HtmlDocument();
doc.LoadHtml(html);
var input = doc.DocumentNode.SelectSingleNode("//*[@name='__Token']");
var token = input.Attributes["value"].Value;
//add all necessary component to collection
NameValueCollection collection = new NameValueCollection();
collection.Add("__Token", token);
collection.Add("return", "");
collection.Add("Email", "11111111@hotmail.com");
collection.Add("Password", "1234");
var newCollection = GenerateQueryString(collection);
return newCollection;
}

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