Hi,

I'm having a little trouble understanding the code between the Sub Page_Load() and End Sub in Chapter 3's checkbox exercise. I would be grateful if someone could help explain it to me because the book isn't very thorough. Feel free to AIM me at: computertutor9

Thanks!

Kara

Can you post your question so we can help?

Sure.

I don't understand "msg +=" and "msg = msg &"

Why would you want to state the contents of the variable msg twice. What do each of these two "msg"'s represent? And does the message variable change with each selected item?

Also, what's the point of the "lblCities.Text = msg" line?

Thanks.

Kara

msg+= concatenates the contents of msg with whatever is on the other side of the equals sign.

I can't find a msg = msg & in the example, what line is it on?

lblCities.Text = msg; assigns the contents of msg (the cities that were chosen and then concatented with line breaks in between) to the the asp:Label in the body of the HTML with the id lblCities. At the start of the program lblcities has no text value and so is blank, it is only after submit has been clicked that you give it a value.

hope this helps.

Tom

The reason that it's done that way is to 'loop' through the checkbox control and store all the cities checked into a variable instead of just one city. If you did not do it that way you would just get the last city checked no matter how many checks were before the last one checked.

OK, I still have a little trouble with it. But the explanations helped. Thanks.

Kara