private void buttonRemoveRouter_Click(object sender, EventArgs e)
 {
     try
     {
         Net.RemoveRouter(int.Parse(textBoxRouterId.Text));
         RouterForm rf = (RouterForm)RoutersForms.First(x => x.Text == textBoxRouterId.Text);
         rf.Close();
         RoutersForms.Remove(rf);
         RefreshRouters();
     }
     catch (Exception exc)
     {
         MessageBox.Show(exc.Message);
     }
 }