Auto fill web page

hey there !

Refer this link :

http://stackoverflow.com/questions/15447864/open-webbrowser-auto-complete-form-components-and-submit

For captcha you can do like this :

If you know the id of the captcha element for a certain website you can get it's src attribute and download from the url.
Here is an example of a captcha img in a div tag with the id "recaptcha_image".

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<div id="recaptcha_image" style="width: 
300px; height: 57px; "><img style="display:block;" 
alt="reCAPTCHA challenge image" height="57" width="300" 
src="http://www.google.com/recaptcha/api/image?c=03AHJ_Vus407GuhxqGfVSZawlQp2afR8Ov0GI0zpZolxeHbjXa5dRThbO0XWzAduWq5P7JNzA99oGPLSjuWQtnKotfv4Jy0EwkXBZv9kj9531F6YEwSop56pRTh4hOsWnO7n-CxLtH_w4pKC6OpRdw3KZZOXjgts3-Dg"></img></div>

Here is an example of how to get the image with a windows forms browser:

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HtmlElement ele = browser.Document.GetElementById("recaptcha_image"); 
if (ele != null) {     string imageSource = ele.GetAttribute("src"); }


Hope that helps !