How to Use Dynamically Created Button/textBox in C# Windows Forms?

Question

private void createButton()
{
    flowLayoutPanel1.Controls.Clear();

    for (int i = 0; i < 4; i++)
    {    
        Button b = new Button();
        b.Name = i.ToString();
        b.Text = "Button" + i.ToString();
        flowLayoutPanel1.Controls.Add(b);
    }

}
private void button1_Click(object sender, EventArgs e)
{
    createButton();
}

I Used this code to create some buttons on runtime , now how can i use those created buttons to perform diffrent actions? Im kindz new to this so please help me , very much appreciated :)

score 8 · Answer 1 · answered Apr 18 '13 at 13:39

8

You can assign an event handler to the click event:

b.Click += SomeMethod;

SomeMethod must have the following signature:

void SomeMethod(object sender, EventArgs e)

answered Apr 18 '13 at 13:39

Daniel Hilgarth

171,043
40
335
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And a shorter example for those who cares: `b.Click += (sender, e) => { var clickedButton = (Button)sender; };` =) – Mario S Apr 18 '13 at 13:43
2

@Mario When you have an anonymous event handler you can avoid casting `sender` and just close over the button itself. – Servy Apr 18 '13 at 13:44
@Servy Yepp, I'm aware of that =) Just wanted to be more explicit and show what the sender is. I was guessing the OP didn't know about closures. – Mario S Apr 18 '13 at 13:47

score 1 · Answer 2 · edited May 23 '17 at 12:12

1

When you create your button, you need to subscribe to the Click event like this :

Button b = new Button();
b.Click += new EventHandler(b_Click);
// or
b.Click += b_Click;
// or
b.Click += delegate(object sender, EventArgs e) {/* any action */});
// or
b.Click += (s, e) => { /* any action */ };

void b_Click(object sender, EventArgs e)
{
    // any action
}

This is something that is automatically done when your are is the designer in Visual Studio, and you click on a button to create the method button1_Click.
You can search in the Designer.cs of your form, you will find an equivalent line:

button1.Click += new EventHandler(button1_Click);

Related question:

How can i create dynamic button click event on dynamic button

edited May 23 '17 at 12:12

Community

1
1

answered Apr 18 '13 at 13:40

Cyril Gandon

16,830
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can you please evaluate this a litle more in detail :) actually im trying to make a simple form , which creates fields as may as user wants & then the user can perform action between them , like if the user wants 2 textBox , he writes 3 & the textBox are created on runtime , & then those 2 textBox i.e textBox1 & textBox2 can get any value & the third textBox shows the added result. how to do this? – Usman Ozzie Q Qadri Apr 18 '13 at 14:55

Sébastien Garmier · Answer 3 · 2013-04-18T13:47:19.617

1

b.Click += delegate(object sender, EventArgs e) {
   Button clickedButton = (Button)sender; //gets the clicked button
});

edited Apr 18 '13 at 13:47

answered Apr 18 '13 at 13:41

Sébastien Garmier

1,263
9
16

1

You can simplify the syntax to just `b.Click += (s, e) => { /* code */ };` – Servy Apr 18 '13 at 13:43

How to Use Dynamically Created Button/textBox in C# Windows Forms?

3 Answers3