I'm using Web Browser Control in a windows form (vb.net) to display one of our website (ASP.NET) as a part of the windows application. Everything works fine, but when I've a popup window from the website page, I'm loosing the ASP.Net session. I've used extended version of web browser control to have Navigate2 event to catch the popup window and open it in a windows form web browser control again, then it works, but I have problems with size of the popup and close button in the html popup window. Please let me know if there is a work around for loosing session in Web browser control popup window in asp.net. How can I open a popup window from my winforms web browser control without loosing the session?