Quite often you want to write some code that has to iterate over the collection; For example: Finding an element in a list of to see if it is present.

For a program I’m working on at my day job, I decided to implement a rule that says each account must have at least one user who has admin rights for the account, and here is some code that checks that condition.

(Note to self: Find good code formatting plug-in for wordpress)

bool AtLeastOneAdmin = false;
foreach(User u in Users)
{
        if (u.isAdmin)
        {
                AtLeastOneAdmin = true;
                break;
        }
}

Pretty straightforward, Now lets write the same code using Linq:

Bool AtLeastOneAdmin = (from u in users where u.isAdmin == true select u).Count() > 0;


That does the exact same thing and only takes up one line of code!