redirect to another page if page reloaded 2nd time

Question

i have a Quiz webpage, that showing questions and time with timer control. now i want that,

if user click on browser reload button and try to reload webpage then he/she will be redirected to another page. 

 

code should be work only, if user try to reload.  Not when first time page loaded.

 

i tried this code

 

var reload = confirm("are you sure you want to leave? your progress will be lost");

if (reload) {

location.href = "http://stackoverflow.com"; // Redirect.

}

 

but this code. showing confirm box, very first time also, when page loaded. 

now i dont want to show this confirm box and redirect when first time web page loaded.

i want that. code should be work only, if user try to reload.  Not when first time page loaded.

 

or if there is a way to achieve this in server side coding.  asp.net C# 4.5 2017

Hope you Understand,

 

thanks for any help.