private void button1_Click(object sender, EventArgs e)
{
try
{
Class1 girubaSumDLL = new Class1();
if (string.IsNullOrEmpty(textBox1.Text))
{
textBox1.Text = "0";
}
if (string.IsNullOrEmpty(textBox2.Text))
{
textBox2.Text = "0";
}
if (string.IsNullOrEmpty(textBox3.Text))
{
textBox3.Text = "0";
}
int sum = girubaSumDLL.AddThreeNumbers(int.Parse(textBox1.Text), int.Parse(textBox2.Text), int.Parse(textBox3.Text));
textBox5.Text = sum.ToString();
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}