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I've been doing this with RestSharp, but I'm trying to migrate off that.

How can I do this with HttpClient , please?

I have the following RestSharp code

var restRequest = new RestRequest("account/authenticate", Method.POST);
restRequest.AddParameter("Email", email);
restRequest.AddParameter("Password", password);
How can I convert that to use the (Microsoft.Net.Http) HttpClient class, instead?
Take note: I'm doing a POST
Also, this is with the PCL assembly.
Lastly, can I add in a custom header. Say: "ILikeTurtles", "true".
                Both of your questions have been answered before, see .NET HttpClient. How to POST string value? and Adding Http Headers to HttpClient (ASP.NET Web API). Try to use the search.
– CodeCaster
                Feb 16, 2014 at 1:13
                ... hold on a second here.  Are there really three HttpClient classes now?  System.Net.Http.HttpClient, Microsoft.Net.Http.HttpClient and Windows.Web.Http.HttpClient?  Really, Microsoft?  Really?
– Charles
                Feb 16, 2014 at 5:27
                That's a really good question. I've only read about Microsoft.Net.HttpClient .. there really are -three- ??
– Pure.Krome
                Feb 16, 2014 at 22:34
                @Charles There are two.  System.Net.Http.HttpClient which is in the nuget package Microsoft.Net.Http and Windows.Web.HttpClient which is a native implementation.
– Darrel Miller
                Feb 17, 2014 at 1:32
                @Pure.Krome may i know why you decided to go with  Microsoft.Net.HttpClient instead of RestSharp..The latters syntax seems to be more readable
– Shaiju Janardhanan
                May 26, 2016 at 14:56
var httpClient = new HttpClient();
httpClient.DefaultRequestHeaders.Add("ILikeTurtles", "true");
var parameters = new Dictionary<string, string>();
parameters["Email"] = "myemail";
parameters["Password"] = "password";
var result = await httpClient.PostAsync("http://www.example.com/", new FormUrlEncodedContent(parameters));
If you're not opposed to using a library per se, as long as it's HttpClient under the hood, Flurl is another alternative. [disclaimer: I'm the author]
This scenario would look like this:
var result = await "http://www.example.com"
    .AppendPathSegment("account/authenticate")
    .WithHeader("ILikeTurtles", "true")
    .PostUrlEncodedAsync(new { Email = email, Password = password });
This code isn't using HttpClient but it's using the System.Net.WebClient class, i guess it does the same thing though.
private static void Main(string[] args)
        string uri = "http://www.example.com/";
        string email = "email@example.com";
        string password = "secret123";
        var client = new WebClient();
        // Adding custom headers
        client.Headers.Add("ILikeTurtles", "true");
        // Adding values to the querystring
        var query = HttpUtility.ParseQueryString(string.Empty);
        query["email"] = email;
        query["password"] = password;
        string queryString = query.ToString();
        // Uploadstring does a POST request to the specified server
        client.UploadString(uri, queryString);
        
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