How to use returned linq variable?

Question

I\'ve decided to take a quick look into the LINQ side of things, as opposed to just using a straight up foreach loop, but i\'m having some trouble getting it to work, mainly

Answer 1

Use First / FirstOrDefault / Single / SingleOrDefault to get an item of the particular type from the collection.

   var value = selectedSiteType.First(); 
   // returns the first item of the collection

   var value = selectedSiteType.FirstOrDefault(); 
   // returns the first item of the collection or null if none exists

   var value = selectedSiteType.Single(); 
   // returns the only one item of the collection, exception is thrown if more then one exists

   var value = selectedSiteType.SingleOrDefault(); 
   // returns the only item from the collection or null, if none exists. If the collection contains more than one item, an exception is thrown.