Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

C# ASP.NET MVC Basics Modeling and Presenting Data Updating the Controller

Posted by Mahmoud Nasser
Mahmoud Nasser
5,507 Points

ASP.net MVC Routing

I got Confused of the URL routing in asp.net and still i didn't understand why did we updated the ID in the GetComicBook Method to receive a nullable id ? why did the instructor did this ?