How to pevent an user from closing the browser in asp.netLocked
In my ASP .Net web application, the customer has the following requirement. Whenever user tries to close the browser by using the X at the top (the hard close), I want to throw a message popup to user saying that they have not logged out of the application. Are you sure to close? And I want to give them Yes/No options so that if they click on yes, I will let them close otherwise the browser stays open. How can I acheive this?