I\'m currently using Twitter\'s Bootstrap toolkit on a new project and I had a question on the best way to use the modal dialog in ASP.NET MVC3.
Is the best practice
This really depends on your design, but you should have a template for the modals.
On a single web app for example, you should have a template lying around that you would create a new instance from each time.
Usually on a normal website you would want to store this template inside a js creation function, so that you won't have to send the file to the user each time via http, and they can have it cached.