IN MVC, onchnage of html select not afffecting in cshtml

Question

IN MVC, onchange of html select in Layout page not afffecting in cshtml.

 

Layout page 

 

 

 

 

 

above code is like i am binding select option with dynamic data.

 

But if i write on change like below, Value selected as well in _Layout page, But not in its .CSHTML page.  So charts and all in this .CSHTML not loading depends on selected option in dropdown.

 

Please assist with solution.