private void button1_Click(object sender, EventArgs e) { label5.Text = "Visitor Status: " + msh.GetVisitorStatus(textBox3.Text); List <string> resut = msh.GetVisitorHistory(textBox3.Text); for (int i = 0; i < resut.Count; i++) { this.listBox1.Items.Add(resut[i].ToString()); } }