javascript - confirmation popup message (ASP.NET/VB) -

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i want have confirmation message box pop when user clicks cancel button on form. believe correct javascript code:

function confirmation() {         var answer = confirm("are sure want cancel? information have entered discarded.")         if (answer) {             window.location = "index.htm";         }     }

but, i'm not sure how can call function vb code behind page.

on cancel button add markup attribute

onclientclick="return confirmation();"

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