Essential Books

ElementAtOrDefault

suggest change 
var names = new[] {"Foo","Bar","Fizz","Buzz"};

var thirdName = names.ElementAtOrDefault(2);
Console.WriteLine(thirdName); //Fizz

var minusOnethName = names.ElementAtOrDefault(-1);
Console.WriteLine(minusOnethName); //null

var fifthName = names.ElementAtOrDefault(4);
Console.WriteLine(fifthName); //null
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LINQ:
* LINQ
* SelectMany flat map
* Where filter
* Any
* GroupJoin
* ToLookup
* Except
* Zip
* Aggregate fold
* Concat
* Count
* Distinct
* Intersect
* SequenceEqual
* Min
* Cast
* All
* Sum
* Select map
* FirstOrDefault
* Take
* SingleOrDefault
* Reverse
* OfType
* Max
* Skip
* Average
* LastOrDefault
* Last
* GroupBy
* ToDictionary
* Union
* ToArray
* ToList
* Single
* ElementAt
* ElementAtOrDefault
* SkipWhile
* TakeWhile
* DefaultIfEmpty
* First find
* Contains
* Join
* OrderByDescending
* OrderBy
* Empty
* ThenBy
* Range
* Left Outer Join
* Repeat
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