I want to use the bootstrap multi select plugin : Bootstrap Multiselect
but it is not working for me.
To add to Indi's answer, I did face the same issue where in I had two jquery reference and hence had a list box instead of multiselect drop down. This was because my page inherited from the Layout page which had it's own jquery reference. So make sure you are having the reference in the Shared/_Layout.cshtml or in your page where you are implementing the drop down.