videos = videos.OrderByDesc(x =&gt; x.Score).ToList();


Then set this sorted collection as datasource to ListBox.

Edit: to answer your question from comments.

You should separate presentation from data, ie have some data structures to hold data, not storing them in UI. So use for example:
List&lt;Video&gt; videos - this collection is filled from DB, XML, NetFlix webservice, whatever.

After filling this collection, bind it tu UI, in your case ListBox. Then, if you want to sort it, just use code i have posted.

Sort ListBox C#


Why is the above structure not considered a valid structure for the nitrate ion? Is it because adding a double bond reduces the formal charges present on the nitrogen? Does the above form exist anywhere?
