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First find

suggest change 
var numbers = new[] {1,2,3,4,5};

var firstNumber = numbers.First();
Console.WriteLine(firstNumber); //1

var firstEvenNumber = numbers.First(n => (n & 1) == 0);
Console.WriteLine(firstEvenNumber); //2

The following throws InvalidOperationException with message “Sequence contains no matching element”: 

var firstNegativeNumber = numbers.First(n => n < 0);
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