i am trying to post on different websites using c#

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C#

Hi, i am trying to post on different websites using c#. I am doing it through a web Browser( the one already in .Net). The code i have done so far is below, in this i am successfully opening facebook and when i click on button_2 it automatically fills the login form and i am successfully logged in then. This means i can do it for other sites as well by doing a little changes. Now the problem here is i want to post some data to different sites, like a link or something, and when i am logged in successfully like in did in the code below what lets say a page opens and in that page i have to fill some data or that link the fields they ask. How to do that to proceed further to fill other form fields? and when i have done that i want to save that final result from that site to a text file?
kindly tell me how to do that? or any useful links.
Regards.

private void button1_Click(object sender, EventArgs e)
        {

            webBrowserCtl.Navigate("https://login.facebook.com/login.php?login_attempt=1");
            webBrowserCtl.DocumentCompleted += new WebBrowserDocumentCompletedEventHandler(webBrowser1_DocumentCompleted);
  
        }
        void webBrowser1_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
        {
            string s = webBrowser1.DocumentText;
           // btnLogin.Enabled = true;
        }

        private void button2_Click(object sender, EventArgs e)
        {
            HtmlElement ele = webBrowserCtl.Document.GetElementById("email");
            if (ele != null)
                ele.InnerText = "email here";

            ele = webBrowserCtl.Document.GetElementById("pass");
            if (ele != null)
                ele.InnerText = "password here";

            ele = webBrowserCtl.Document.GetElementById("Login");
            if (ele != null)
                ele.InvokeMember("click");
        }