Currently, i have a button called btnInclude, when clicked on form1 for example, it will open a new window called form2. After i press a button in form2, i will take the necessary values and form2 window should close. Another thing is i do not know how to get the values from form2 and get form1 to auto-refresh and show the values retrieved from form2.

I am also not very sure how to close a window in the server coding. Thanks

You can't, from the server side. You need to close the window using Javascript.

oh okay thanks