As we know that default dropdown list is not searchable. Simple way to create searchable in asp.net/SharePoint solution.

Problem:

Resolution: ( Converting simple dropdown list to searchable )

Add following CSS link in the page:

Add Following script link in page:

To change any dropdown list to searchable dropdown list:

Add “chosen-select” class to dropdown control.

Necessary css and js file: Download

More details: Click Here !!