private void btnSearchUser_Click(object sender, EventArgs e) { lstUserResult.Items.Clear(); if (cmbUserSearch.SelectedIndex == 0 && userIdSearch != 0) { userSearch = server.SearchUser(userIdSearch); if (userSearch != null) { lstUserResult.Items.Add(userSearch); lblNote.Visible = true; } } else if (cmbUserSearch.SelectedIndex == 1 && txtUserSearch.Text != "") { userSearch = server.SearchUser(txtUserSearch.Text); if (userSearch != null) { lstUserResult.Items.Add(userSearch); lblNote.Visible = true; } } }