Objects.Where(el => el.Id == myRequestedId).FirstOrDefault().Name; //Crashes when there is no result, but this has been handled by the null operator in c# 5.0 => Objects.Where(el => el.Id == myRequestedId).FirstOrDefault()?.Name; The issues was not Linq, it is/was c#

Single() is when there is absolute only 1 result. > 1 result is not expected ( i'll admit that i never use Single or SingleOrDefault() )

And using paging is the same thing in linq as it is in SQL. If you don't know how Linq works, you should learn it. What you should know is that .ToList() hits the database, so when you query all the objects, you get all the objects. Limit your query before the database query :)

Here are the results of page 4 with 10 items : Objects.Skip(10 x 3).Take(10).ToList(); //fetches 10 items = paging in the query

Here is how someone could write it without knowing Linq: Objects.ToList().Skip(10 x 3).Take(10);//fetches all the items and does the paging on the list.

As long as your DataType is an IQueryable<T>, it doesn't hits the database. When it's a List<T> (eg. when calling .ToList()) it's too late