Question

I have 3 different radio buttons and one label. How to update text on that label when radio is checked?

    private void Button_Click(object sender, EventArgs e)
    {
        foreach (Control item in groupBox1.Controls)
        {
            if(item.GetType() == typeof(RadioButton))
            {
                if (((RadioButton)item).Checked)
                {
                    label1.text = obj[item.TabIndex-1].name;
                }

            }

        }
    }

I wrote something like that but it is connected to button but i don’t want it to work that way. I’d like to make event connected to all 3 radio buttons but i don’t know how to do that.

Answer 1

You should look in to adding an event for each radio button. Specifically, look at the CheckedChanged event.

protected void ARadioButton_CheckedChanged(object sender, EventArgs e)
{
    if (sender is RadioButton)
    {
       RadioButton radioButton = (RadioButton)sender;
       if (radioButton.Checked)
       {
           label.Text = ARadioButton.Text;
       }
}

Or as Oded mentioned, use the same event and take advantage of the sender parameter. They will all point to the same event.

//somewhere in your form object, probably InitializeComponent()
ARadioButton1.CheckChanged += new EventHandler(ARadioButton_CheckedChanged);
ARadioButton2.CheckChanged += new EventHandler(ARadioButton_CheckedChanged);
ARadioButton3.CheckChanged += new EventHandler(ARadioButton_CheckedChanged);

protected void ARadioButton_CheckedChanged(object sender, EventArgs e)
{
    if (sender is RadioButton)
    {
        RadioButton radioButton = (RadioButton)sender;
        if (radioButton.Checked)
        {
            label1.Text = "Clicked " + radioButton.Name;
        }
    }
}