[SSparks]

Can you define what this syntax is up to.

listBox1.Items.Add((Keys)random.Next(65, 90));

I understand everything except for the "(Keys)" part and its relationship
in the syntax being right before the "random.Next". I get the overall purpose of the code statement which is to pick a random # that then corresponds to a Key value that gets sucked into the listBox1 control. But what is the '(keys)' syntax referred too? What I have seen so far this type of syntax would suggest a casting of the random.Next(65,90) class-method. Or is this a receptor of the returned random number from random.Next somehow? Any examples in MSDN? Hard to search with (Keys)class.method().

Thanks!

[pepita]

"Keys " is an enumeration like you will see later in the book.
You have something like :

public enum Key {

A =0
B=1
.........
........
}

If you want to get "B" , you need an explicit cast from number "1".

[SSparks]

Thanks. This sends me in a good direction to understand.

[Diaz]

Hi,
I tried this exercise. However, there seem to be an issue with

Quote

listbox1.Items.Add((Keys)random.Next(65,90));

line. I can see that keys being counted under key_down event. But no letter is displayed in listbox1 in the form.
Can someone please point out, what I would be doing wrong?
I rebuilt the form twice.

-------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Post 2: I managed to worked it out. However with following two things needed to be done.

1.

public Form1()
        {
            InitializeComponent();
            KeyPreview = true;

        }

without the above the programme doesn't recognize correct keys when pressed.
with it, unable to see all the letters but only one at a time.

2. timer object's Enabled property has to be set to TRUE.

And with all of these settings, the programme gives an error at,

difficultyProgressBar.Value = 800 - timer1.Interval;

Argument out or range exception handled...

Can someone please advise me, why I needed to do the above property /code changes to make my programme work - instead of just using the code using the book. Why am I getting argument out of range exception here?

This post has been edited by Diaz: 30 September 2012 - 02:05 AM