SharePoint – Custom Sign Out page

Developing Form Base Authentication (FBA) for Sharepoint project sometimes need big struggle, besides developing OOTB Sharepoint itself. After created custom login, I found new problem when tried to sign out from default link. It will show error page / internal server error. Caused by default page is not working properly, it signed out but doesn’t remove cookies from browser. So what I did is creating new application page, put method to clear cookies, then add a link inside default page which redirect to sign-out page.
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