How to disable backbutton of webform?

Hi,

 

What if user click on Browser's Back button.

 

Instead of that you can do one thing use session variable. When user logged in your application set that session variable to true or some value.

When user will logout set session value to false and redirect on login page.

Also on your home page load event check that session value. if session value is true means if your is logged in then redirect to Home page else redirect to login page.

 

In this way you can slove your problem.

 

I hope this will help you.