private void Button1_Click(object sender, EventArgs e)
{
Calculator cal = new Calculator();
DialogResult res = MessageBox.Show("Hello", "My message", MessageBoxButtons.YesNo, MessageBoxIcon.Information);
if (res == DialogResult.Yes)
{
Hide();
cal.Show();
}
}
private void CalcBtn_Click(object sender, EventArgs e)
{
Calculator calculator = new Calculator();
calculator.Show();
}