How to dynamically remove a button in a form

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public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            Button b = new Button();
            b.Text = "button2";
            
            Controls.Add(b);
            b.Click += Hello;
            
        }

      

        private void Hello(object sender, EventArgs e)
        {
            MessageBox.Show("hello World");
        }

how to remove button2 after displaying "Hello World"?

What I have tried:

b.Dispose();

it does not display button at first.

Thank you!

Posted 24-Oct-17 20:24pm

Member 13462842

Updated 25-Oct-17 1:23am

v2

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OriginalGriff · Accepted Answer · 2017-10-24T20:39:00

To remove it, you must first remove it from the Controls collection!
That's difficult with your existing code, because unless it's the only button on your form (and it isn't), you will have difficulty identifying which button to remove!

Try this:

public Form1()
{
    InitializeComponent();
}
private List<Button> buttons = new List<Button>();
private void button1_Click(object sender, EventArgs e)
{
    Button b = new Button();
    b.Text = "button2";
    
    Controls.Add(b);
    buttons.Add(b);
    b.Click += Hello;
    
}

private void RemoveButtons()
{
    foreach (Button b in buttons)
    {
        Controls.Remove(b);
        b.Click -= Hello;
    }
    buttons.Clear();
}

private void Hello(object sender, EventArgs e)
{
    MessageBox.Show("hello World");
}

lukeer · Accepted Answer · 2017-10-25T01:23:00

No need to search for the button since it's already known in its own click handler:

C#

private void Hello(object sender, EventArgs e)
{
    MessageBox.Show("hello World");
    
    Button thisButton = sender as Button;
    if(thisButton != null)
    {
        thisButton.Click -= Hello;
        Controls.Remove(thisButton);
    }
}

Disclaimer: Code not tested in any way, no particular purpose, you know all that.

How to dynamically remove a button in a form

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