private void btnOk_Click(object sender, EventArgs e) { if (cbComputers.SelectedIndex < 0) { MessageBox.Show("Вы не выбрали компьютер", "Warning", MessageBoxButtons.OK, MessageBoxIcon.Warning); return; } this.Hide(); using (Form proccess_inf_form = new frmProccessInfo(cbComputers.SelectedItem.ToString())) { proccess_inf_form.ShowDialog(); } this.Show(); }