How to fill and submit a web form on a third party website using windows application? [closed]

Question

I am doing a project in which I have to make a windows application that can Take a URL in textbox from user. Now when the user press the Proceed button, the application should open that URl in a webbrowser control and fill the form on that page containing userID & password textboxes and submit it via the login button on that web page. Now my application should show the next page in that webbrowser control to the user.

I can open the url in the application's webbrowser control through my C# Code, but I can't figure it out that how to find the userID & pasword textboxes on that web page that is currently opened in the webbrowser control of my application, how to fill them, how to find the login button & how to click it through my C# Code.

Answer 1

For this you will have to look into the page source of the 3rd party site and find the id of the username, password textbox and submit button. (If you provide a link I would check it for you). Then use this code:

//add a reference to Microsoft.mshtml in solution explorer
using mshtml;

private SHDocVw.WebBrowser_V1 Web_V1;

Form1_Load()
{
    Web_V1 = (SHDocVw.WebBrowser_V1)webBrowser1.ActiveXInstance;
}

webBrowser1_Document_Complete()
{
if (webBrowser1.ReadyState == WebBrowserReadyState.Complete)
    {
        if (webBrowser1.Url.ToString() == "YourLoginSite.Com")
        {
            try
            {
                HTMLDocument pass = new HTMLDocument();
                pass = (HTMLDocument)Web_V1.Document;
                HTMLInputElement passBox = (HTMLInputElement)pass.all.item("PassIDThatyoufoundinsource", 0);
                passBox.value = "YourPassword";
                HTMLDocument log = new HTMLDocument();
                log = (HTMLDocument)Web_V1.Document;
                HTMLInputElement logBox = (HTMLInputElement)log.all.item("loginidfrompagesource", 0);
                logBox.value = "yourlogin";
                HTMLInputElement submit = (HTMLInputElement)pass.all.item("SubmitButtonIDFromPageSource", 0);
                submit.click();
            }
            catch { }
        }
    }
}