static void Main(string[] args)
{
calculation cal = new calculation();
int i = cal.Add(23, 37);
int i2 = cal.Sub(28, 12);
Console.WriteLine("addition result is : {0}", i);
Console.WriteLine("substruction result is : {0}", i2);
Console.ReadLine();
}
private void button2_Click(object sender, EventArgs e)
{
try
{
int i = cal.Sub(int.Parse(textBox1.Text), int.Parse(textBox2.Text));
textBox3.Text = i.ToString();
}
catch (Exception ex)
{
MessageBox.Show("error in add button event..." + ex);
}
}