jquery not loading in asp.net mvc

To resolve your issue:

 

Make sure that you have added reference for jQuery and datpicker plugin.

 

Secondly adding javascript must be proper sequence. Let's say you have added code for datepicker and later  you are adding jQuery library. In this scenario it won't work. First jQuery library then datepicker code...

 

See the error in console tab by pressing F12 in your browser.