How to make the browser login and do something then re-login with another account

Question

I have a simple program that i can open a webpage and i paste the user name and password from textbox1

then do something inside, after that a want to re-login with another account

i can do it for tow or three accounts put i want to deal with an open number of usernames

i want to take usernames from a Multiline textbox

the code to paste only the first line and the pass word and click ok is:

TextReader read = new StringReader(textBox2.Text);
int rows = 500;

string[] text1 = new string[rows];
for (int r = 1; r < rows; r++)
{    
    text1[r] = read.ReadLine();
    // textBox3.Text = text1[r];

    HtmlElement ele = webBrowser1.Document.GetElementById("name"); if (ele != null)
    ele.InnerText = text1[r];

    ele = webBrowser1.Document.GetElementById("password"); if (ele != null)
    ele.InnerText = text1[r] + "5";

    ele = webBrowser1.Document.GetElementById("s1"); if (ele != null)
    ele.InvokeMember("click");

text1[r] means that it will take the just the first line

now the program is inside then logout with this code

webbrowser1.navigate("http://example.com/logout.php");

then i want to re login and do the same put with the second line (another account) then the third etc. How can i do it?

You know this does read kind of like you're trying to write a brute force password hacker - I'm sure you wouldn't do that would you? — James Gaunt, Oct 08 '12 at 17:32
It's a legitimate programming question. I'm suspecting that he has a LONG time before he's able to hack/brute force anything :). He'll get shut down for DOS attacking way before he's able to get through the password list. — Kiril, Oct 18 '12 at 22:18

score 1 · Accepted Answer · edited May 23 '17 at 12:12

It doesn't quite work like that. What you need to do is behave like the browsers, namely, submit the form:

You will have to study the structure of the POST request and build a similar post request with your application. You'll have to use something like FireBug to investigate the network traffic that's generated when you submit the form and duplicate the POST request. Take a look at this question too: http form post change submit data

How to make the browser login and do something then re-login with another account

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