Here is my solution:using System;
class StringTry{
public static void Main(){
string[] group = {"Kurt", "Peter", "Paul", "Mary"};
foreach(string name in group)
Console.WriteLine(name); // Kurt Peter Paul Mary
Console.WriteLine();
Array.Sort(group);
foreach(string name in group)
Console.WriteLine(name); // Kurt Mary Paul Peter
int res = Array.BinarySearch(group, "Mary");
Console.WriteLine(res); // 1
Console.WriteLine();
Array.Reverse(group);
foreach(string name in group)
Console.WriteLine(name); // Peter Paul Mary Kurt
}
}