private void button2_Click(object sender, EventArgs e)
{
Dele temp = null;
try
{
switch(comboBox1.SelectedItem.ToString())
{
case "+": temp = new Dele(cal.Add); break;
case "-": temp = new Dele(cal.Sub); break;
case "*": temp = new Dele(cal.Mul); break;
case "/": temp = new Dele(cal.Div); break;
}
}
catch
{
MessageBox.Show("정상적으로 입력해 주세요");
}
if(temp != null && textBox2.Text != "0")
temp.BeginInvoke(int.Parse(textBox1.Text), int.Parse(textBox2.Text), Callback, null);
}
