// This example demonstrates the ConsoleKeyInfo.Equals() method.

using System;
using System.Text;

class Sample 
{
    public static void Main() 
    {
    string k1 = "\nEnter a key ......... ";
    string k2 = "\nEnter another key ... ";
    string key1 = "";
    string key2 = "";
    string areKeysEqual = "The {0} and {1} keys are {2}equal.";
    string equalValue = "";
    string prompt = "Press the escape key (ESC) to quit, " + 
                    "or any other key to continue.";
    ConsoleKeyInfo cki1;
    ConsoleKeyInfo cki2;


//
// The Console.TreatControlCAsInput property prevents this example from
// ending if you press CTL+C, however all other operating system keys and 
// shortcuts, such as ALT+TAB or the Windows Logo key, are still in effect. 
//
    Console.TreatControlCAsInput = true;

// Request that the user enter two key presses. A key press and any 
// combination shift, CTRL, and ALT modifier keys is permitted.
    do 
    {
        Console.Write(k1);
        cki1 = Console.ReadKey(false);
        Console.Write(k2);
        cki2 = Console.ReadKey(false);
        Console.WriteLine();
//
        key1 = KeyCombination(cki1);
        key2 = KeyCombination(cki2);
        if (cki1.Equals(cki2))
            equalValue = "";
        else
            equalValue = "not ";
        Console.WriteLine(areKeysEqual, key1, key2, equalValue);
//
        Console.WriteLine(prompt);
        cki1 = Console.ReadKey(true);
    } while (cki1.Key != ConsoleKey.Escape);
// Note: This example requires the Escape (Esc) key.
    }

// The KeyCombination() method creates a string that specifies what 
// key and what combination of shift, CTRL, and ALT modifier keys 
// were pressed simultaneously.

    protected static string KeyCombination(ConsoleKeyInfo sourceCki)
    {
    StringBuilder sb = new StringBuilder();
    sb.Length = 0;
    string keyCombo;
    if (sourceCki.Modifiers != 0)
        {
        if ((sourceCki.Modifiers & ConsoleModifiers.Alt) != 0)
            sb.Append("ALT+");
        if ((sourceCki.Modifiers & ConsoleModifiers.Shift) != 0)
            sb.Append("SHIFT+");
        if ((sourceCki.Modifiers & ConsoleModifiers.Control) != 0)
            sb.Append("CTL+");
        }
    sb.Append(sourceCki.Key.ToString());
    keyCombo = sb.ToString();
    return keyCombo;
    }
}

/*
This example produces results similar to the following output:

Enter a key ......... a
Enter another key ... a
The A and A keys are equal.
Press the escape key (ESC) to quit, or any other key to continue.

Enter a key ......... a
Enter another key ... A
The A and SHIFT+A keys are not equal.
Press the escape key (ESC) to quit, or any other key to continue.

Enter a key ......... S
Enter another key ...
The ALT+SHIFT+S and ALT+CTL+F keys are not equal.
Press the escape key (ESC) to quit, or any other key to continue.

Enter a key .........
Enter another key ...
The UpArrow and UpArrow keys are equal.
Press the escape key (ESC) to quit, or any other key to continue.

*/