Question

private void frmSearch_Load(object sender, EventArgs e)
{
    // TODO: This line of code loads data into the 'bookdatabaseDataSet.Dist_Year' table. You can move, or remove it, as needed.
    this.dist_YearTableAdapter.Fill(this.bookdatabaseDataSet.Dist_Year);
    // TODO: This line of code loads data into the 'bookdatabaseDataSet.Dist_Auth' table. You can move, or remove it, as needed.
    this.dist_AuthTableAdapter.Fill(this.bookdatabaseDataSet.Dist_Auth);
    // TODO: This line of code loads data into the 'bookdatabaseDataSet.Book' table. You can move, or remove it, as needed.
    this.bookTableAdapter.Fill(this.bookdatabaseDataSet.Book);
}

private void button1_Click(object sender, EventArgs e)
{
    Form f4 = new Confirm();
    f4.Show();
    Hide();
}

private void button2_Click(object sender, EventArgs e)
{
    if (MessageBox.Show("Are you sure you want to Exit?", "Exit", MessageBoxButtons.YesNo, MessageBoxIcon.Question) == DialogResult.Yes)
    {
        Application.Exit();
    }   
}

my question is:
I want from the form to give me error message if I didn’t check any of the check boxes. what is the correct code for it? and where should I right it? and thanks a lot for your concern.
form of windows application

Answer 1

I guess you want to ensure at least one checkbox is checked when button1 is clicked, right? If so, place it at the beginning of button1_Click event.

private void button1_Click(object sender, EventArgs e)
{
    if (!checkbox1.Checked && !checkbox2.Checked && !checkbox100.Checked)
    {
        MessageBox.Show("Please select a checkbox.", this.Text, MessageBoxButtons.OK, MessageBoxIcon.Warning);
        checkbox1.Focus();
    }
    else
    {
        Form f4 = new Confirm();
        f4.Show();
        Hide();
     }
}