How Can I Login To Linkedin Using Http Post Request With C#

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I am working on a simple Windows Forms program that take a username and password from a "Textbox" then it show my linked-in name in a "Messagebox".

I want to accomplish the code with the using of "HttpWebRequest" or using any method to send my POST request to Linked-in then i can get the response and find my name to shown it in a "Messagebox".

I am familiar with creating a "GET" Request and also i made some "POST" Requests but in this case i didn't know how can i send my "txt_UserName.Text" and "txt_Password" with the POST Request and how can i receives the Response.

i tried to using Fiddler to capture POST request (=POST) from linkedin when i try to login but it captures more than 4 requests when i see the header of them it seem like a GET Request this is an example of one:

GET /nhome/?trk= HTTP/1.1
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8

and all of them have a multiple cookies values.

This is my POST request code:

public void SubmitData()
    {
        try
        {

            string postData = "This is a test that posts this string to a Web server.";
            byte[] byteArray = Encoding.UTF8.GetBytes(postData);

            // Create a request using a URL that can receive a post. 
            WebRequest request = WebRequest.Create("http://www.linkedin.com");
            // Set the Method property of the request to POST.
            request.Method = "POST";
            // Set the ContentLength property of the WebRequest.
            request.ContentLength = byteArray.Length;
            //Content Length
            request.ContentLength = byteArray.Length;

            // Get the request stream.
            Stream dataStream = request.GetRequestStream();
            // Write the data to the request stream.
            dataStream.Write(byteArray, 0, byteArray.Length);
            // Close the Stream object.
            dataStream.Close();

            // Get the response.
            WebResponse response = request.GetResponse();
            dataStream = response.GetResponseStream();

            StreamReader sr = new StreamReader(dataStream);
            MessageBox.Show(sr.ReadToEnd());

            sr.Close();
            dataStream.Close();




        }
        catch (Exception ex)
        {
            MessageBox.Show("Error: " + ex.Message);
        }
    }

Now the only thing i whish to know, how can i send my username and password as a values to login to linked-in?