posting data to remote URL using WebBrowser

shabya

hello, i am using the WebBrowser Navigate to navigate to a webpage from my c# application. i try to post data to a form which is in that page. (its my page , i control it) first , what is the name of the field i need to put in the post string? is it ID or NAME ? second , i tried various methods but none filled the form textbox with the information i sent. what am i doing wrong? here's the c# code

WebBrowser Web = new WebBrowser();
string postdata = "ctl00_pass=1234";
System.Text.Encoding a = System.Text.Encoding.UTF8;
byte[] SendBytes = a.GetBytes(postdata);

Web.Navigate(WebBase + WebAddress, WebTitle, SendBytes, "Content-Type: application/x-www-form-urlencoded");
.

and here's the website

</form>
.

tnx