Listbox and Fileupload in MVC4

Its not like that. jquery will work offline too. You have to download the script file and reference it wherever you want.

If i have net in mysystem means then only it will work

What was the problem you are facing, if you use jQuery?

could u please tell me how to do that without using jquery?

You can do with jQuery in asynchronous way. Nice example is here with source. So i dont want to explain once again here.