How the Reverse method reverse a existing list and convert into an array?

List<string> dinosaurs = new List<string>();

dinosaurs.Add("Pachycephalosaurus");
dinosaurs.Add("Parasauralophus");
dinosaurs.Add("Mamenchisaurus");
dinosaurs.Add("Amargasaurus");
dinosaurs.Add("Coelophysis");
dinosaurs.Add("Oviraptor");

string[] input = dinosaurs.Reverse().ToArray();

List<string> list = new List<string>();
list.Add("C++");
list.Add("C#");
list.Add("Java");
list.Add("Objective-C");

list.Reverse();
string[] array = list.ToArray();
for (int i = 0; i < array.Length; i++)
{
    Console.WriteLine(array[i]);
}

From MSDN framework blog, came to know that .NET Framework 4.0 has the implementation as the method checks the parameter and then invokes TrySZReverse: this particular method is implemented in native code, not managed code. Because this internal call is native, it is likely heavily optimized for performance.

Most important, though, is that it is much simpler to use Array.Reverse than to implement a custom reversal algorithm. Not only does Array.Reverse use native code, but it also makes your program simpler; it is therefore a clear win in most contexts.