HI Guys I have the same issue and I am looking to solve it. Here is detail I have two web sites WebsiteA and WebSiteB (WebsiteB is not in my control, A type of black box for me.).

Both websites have seprate login page I have alist of users,password of websiteB which I stored in database. I want a kind of common login page. If user is login to websiteA and he want to go to websiteB, he dont have to enter the login and password information again. I can not touch the code of websiteB. it's alredy deployed and runing. In websiteB in login form they have a Userid textbox and Password textbox and and a login Button. This butoon is not a submit button. It has a click event which calls a function to validate the user. it's not a simple post. WebsiteB has one webpage which has different frames. After login sucessfull. The pages doesnt go to any other page it remain on the same page but load the different frame. According to my knowledge. I can use httpwebrequest class. But faceing the following problem.

Can not click the button. Response.Redirect does not work. It seems that WebsiteB is not storing any thing in cookies as cookies always return me a empty string

I really appriciate if anyone can help me on it. How Can I use response.Redirect . As when I redirect it shows me the same login page.