Question

I have a form that is dynamically created, on this form are several radio buttons that are created at runtime. There is a button on this form eg “Next” when the user clicks on the next I want to loop through and check if one of the radio buttons are checked before I continue, I have tried the following:

    void nextButton_Click(object sender, EventArgs e)
    {
        foreach (Control c in _form.Controls)
        {
            if (c is RadioButton)
            {
                RadioButton radio = c as RadioButton;

                if (radio is RadioButton)
                {
                    if (radio.Checked == true)
                    {
                        //code continue to next 
                    }
                    else
                    {
                        MessageBox.Show("You must select at least one.");
                    }
                }

            }
        } 
    }

Kind regards
geo

Answer 1

You can use Linq to make it simpler

bool checked = _form.Controls.OfType<RadioButton>().Any(rb => rb.Checked);

–EDIT–

I updated the answer to recursively search all controls.

bool IsChecked(Control parent)
{
    if (parent.Controls.OfType<RadioButton>().Any(rb => rb.Checked)) return true;

    foreach (Control c in parent.Controls)
        if (IsChecked(c)) return true;

    return false;
}

bool checked = IsChecked(_form);