private void button1_Click(object sender, EventArgs e)
{
classx duration = new classx();
//Note that you should not use Text here, but selectedText
//Note that now your classx takes input from comboBox2.SelectedText
MessageBox.Show("From " + comboBox1.SelectedText + " to " + comboBox2.SelectedText + " it takes around " + duration.Times(comboBox2.SelectedText));
}
private void button1_Click(object sender, EventArgs e)
{
classx duration = new classx();
MessageBox.Show("From " + comboBox1.Text + " to " + comboBox2.Text + " it takes around " + duration.Times());
}