How to detect the page unload in Asp.net MVC?

There are many approaches to detect that page has been loaded, below is one of them:

$(window).unload(function() {
//post - > controller action

$.ajax
({
type: 'POST',
url: '/ControllerName/ActionName',
data : { ParameterCollection },
dataType: 'html',
error: function (xhr, status, error)
{
//show appropriate message
alert('error');
},
success: function(){
//show appropriate message
alert('success');
}
});
});