SingleOrDefault

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var oneNumber = new[] {5};
var theOnlyNumber = oneNumber.SingleOrDefault();
Console.WriteLine(theOnlyNumber);  //5

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

var theOnlyNumberSmallerThanTwo = numbers.SingleOrDefault(n => n < 2);
Console.WriteLine(theOnlyNumberSmallerThanTwo);  //1

var theOnlyNegativeNumber = numbers.SingleOrDefault(n => n < 0);
Console.WriteLine(theOnlyNegativeNumber);  //0

The following throws InvalidOperationException:

var theOnlyNumberInNumbers = numbers.SingleOrDefault();

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