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I want to create a simple seat reservation system where the picture box will change to another image once the user has clicked the picture box. If the image is set as "availableSeat" it will turn green. If the user attempts to select another seat with the status "availableSeat" i want the application to throw an error message. "please unmatch your current seat, before selecting another" etc. Below is the codee that I have so far, I've been trying to do this for a while now and I'm honestly lost, the annoying thing is it seems like its a simple fix. I was thinking of making a separate class and monitoring the seat status that way, but i wouldn't even know where to start.

The problem i have is the user is still given an error message even if the user clicks on a picture box that is set as "seatTaken", i simply just want it to change back to "availableSeat". Secondly if the user selects a seat which is set as availablethey still receive an error message which is not what i want.

All picture boxes are part of the same click event. Can anyone help? i'd really really appreciate it

What I have tried:

Bitmap availableSeat = Properties.Resources.availableSeatt;  
         Bitmap seatTaken = Properties.Resources.provisional;  
         private void Button_Click(object sender, EventArgs e)  
             var pb = (PictureBox)sender;  
             if (n == 1 || pb.Image == seatTaken && n ==1)  
                 MessageBox.Show("Please unmatch seat");  
             if (pb.Image == availableSeat)  
                 pb.Image = seatTaken;  
                 n = 1;  
                 pb.Image = availableSeat;  
                 n = 0;  
             selectedSeatNo = pb.Tag.ToString();  
Updated 21-Mar-21 7:51am
Richard MacCutchan 21-Mar-21 5:38am    
How is that going to handle more than one reservation? A simpler option would be to fill the reservation space with buttons (one for each seat) which change colour as they are allocated.

You're doing it all wrong!

The main problem is that you're trying to treat a bitmap as a seat!
You should create custom class, such as:
public class Seat
	private int col = 0;
	private int row = 0;
	private bool isOccupied = false;
	public Seat(int _col, int _row)
		col = _col;
		row = _row;
	public int Column
		get => col;
		set => col = value;

	public int Row
		get => row;
		set => row = value;
	public bool IsOccupied
		get => isOccupied;
			if(isOccupied && value) //&& value - added!
				throw new Exception($"Seat({col}, {row}) is occupied!");
				isOccupied = value;

As you see, Seat class has got 3 properties (members):
- Row - a row in which this seat is placed
- Column - a column in which this seat is placed
- IsOccupied - boolean value, which get/set information about reservations

Suppose, you've got 6 seats in 2 columns (3 seats in each):
List<Seat> allSeats = new List<Seat>()
	new Seat(1,1){IsOccupied = false},
	new Seat(1,2){IsOccupied = true},
	new Seat(1,3){IsOccupied = true},
	new Seat(2,1){IsOccupied = true},
	new Seat(2,2){IsOccupied = false},
	new Seat(2,3){IsOccupied = false},

Then user tries to make reservations on seat in column=2 and row=1

Seat s = allSeats[3];
	s.IsOccupied = true;		
catch(Exception ex)

Do you think that above operation will end with success?

You can use IsOccupied property to change the bitmap ;)

Good luck!
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Richard MacCutchan 21-Mar-21 13:38pm    
"Do you think that above operation will end with success?"
Certainly we do. Have a 5.
Maciej Los 21-Mar-21 16:14pm    
Thank you, Richard!

Compiling does not mean your code is right! :laugh:
Think of the development process as writing an email: compiling successfully means that you wrote the email in the right language - English, rather than German for example - not that the email contained the message you wanted to send.

So now you enter the second stage of development (in reality it's the fourth or fifth, but you'll come to the earlier stages later): Testing and Debugging.

Start by looking at what it does do, and how that differs from what you wanted. This is important, because it give you information as to why it's doing it. For example, if a program is intended to let the user enter a number and it doubles it and prints the answer, then if the input / output was like this:
Input   Expected output    Actual output
  1            2                 1
  2            4                 4
  3            6                 9
  4            8                16
Then it's fairly obvious that the problem is with the bit which doubles it - it's not adding itself to itself, or multiplying it by 2, it's multiplying it by itself and returning the square of the input.
So with that, you can look at the code and it's obvious that it's somewhere here:
private int Double(int value)
   return value * value;

Once you have an idea what might be going wrong, start using the debugger to find out why. Put a breakpoint on the first line of the method, and run your app. When it reaches the breakpoint, the debugger will stop, and hand control over to you. You can now run your code line-by-line (called "single stepping") and look at (or even change) variable contents as necessary (heck, you can even change the code and try again if you need to).
Think about what each line in the code should do before you execute it, and compare that to what it actually did when you use the "Step over" button to execute each line in turn. Did it do what you expect? If so, move on to the next line.
If not, why not? How does it differ?
Hopefully, that should help you locate which part of that code has a problem, and what the problem is.
This is a skill, and it's one which is well worth developing as it helps you in the real world as well as in development. And like all skills, it only improves by use!
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