private void listViewClient_SelectedIndexChanged(object sender, EventArgs e) { if (listViewClient.SelectedItems.Count == 1) { ClientSet clientSet = listViewClient.SelectedItems[0].Tag as ClientSet; textBoxName.Text = clientSet.Name; textBoxLastName.Text = clientSet.Last_Name; textBoxPhone.Text = Convert.ToString(clientSet.Phone); } else { textBoxName.Text = ""; textBoxLastName.Text = ""; textBoxPhone.Text = ""; } }