How to attach Click event dynamically to multiple buttons?

Question

I'm trying to develop Keno Game in C#, so I have 80 buttons where each of them has the numbers from 1-80 like this:

So what I want to do is that each user should choose 10 numbers (not less, not more) and when a button is being clicked the background color of the button turns green, but I want to know how can that be done without calling the event on each button. These numbers should be saved on the database.

I have tried adding the buttons on a array and looping through the array like this:

var buttons = new[] { button1, button2, button3, button4, button5, ..... };
foreach (var button in buttons)
{
    if (button.Focused)
    {
        button.BackColor = Color.Green;
    }
}

You could use the Tag property to store the number for each button and have one event for all buttons. When the event is called you know which button was pressed based on the Tag and you can save the data in the database and also change the color. — Michael
– Michael, Commented Jun 11, 2020 at 19:38
So, you're creating 80 buttons dynamically at run-time rather than placing 80 individual buttons on the form at design time? And you want to know how to give each one of them a click event? — Joshua Robinson
– Joshua Robinson, Commented Jun 11, 2020 at 19:39
I'm assuming this is a Windows Form in Visual Studios, am I right? — DoragonSoruja
– DoragonSoruja, Commented Jun 11, 2020 at 19:39

001 · Accepted Answer · 2020-06-11 19:57:52Z

2

You can assign the same event handler to each button:

foreach (var button in buttons) {
    button.Click += (sender, e) => {  
        ((Button)sender).BackColor = Color.Green;
    };
}

If you want to add to all buttons on the form, you can call this in the form constructor:

int counter = 0;
public Form1()
{
    InitializeComponent();
    foreach (var c in Controls)
    {
        if (c is Button)
        {
            ((Button)c).Click += (sender, e) =>
            {
                if (counter >= 10) return;
                Button b = (Button)sender;
                b.BackColor = Color.Green;
                counter += 1;
            };
        }
    }
}

edited Jun 11, 2020 at 19:57

answered Jun 11, 2020 at 19:44

001

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8 Comments

Egzon Murati Over a year ago

And where should i call that? Should I make that as a method and then call it to an event or how ?

001 Over a year ago

Wherever you create the buttons. Add this right after creating them. Or if the buttons are created in designer, you can add this in the form constructor - after InitializeComponent();.

Egzon Murati Over a year ago

Yeah, the buttons are created in designer but i wasnt able to attach image in the question section.

001 Over a year ago

I've updated the answer to show how to add to all buttons.

Egzon Murati Over a year ago

How to validate so each user should select exactly 10 buttons?

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