Question

Suppose I have an array of dates

DateTime[] dt = new DateTime[10];
// populate array with dates

How can I find the maximum date without using LINQ?

Answer 1

var maxDate = DateTime.MinValue;
foreach (var date in dt) {
    maxDate = date > maxDate ? date : maxDate;
}

You mention using a sorting algorithm, presumably so that you can just ask for:

var maxDate = dt[dt.Length - 1];

After the array was sorted. The thing is, you’d need to find a sorting algorithm that performs better than O(n) to gain any advantage. Bubble Sort is O(n^2) so there’s no point in using it; it performs worse, on average, than just running through the list once.