We have our wrapper for Linq - Linq to Sitefinity. You can take a look at the developer manual to see how to use Linq queries with our Manager classes to retrieve data. Bellow are a couple of quick examples of using Linq queries with the managers:
var manager = ContentManager.GetManager();
var item = manager.GetContent().Where(t => t.Title ==
var manager = BlogsManager.GetManager();
var posts = manager.GetBlogPosts().Where(t => t.Parent.Title ==
posts = posts.Where(t => t.DateCreated == DateTime.Today.AddDays(-30));
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