C#

 private void backWork_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
        {
            if (e.Cancelled)
            {
            }
            else
            {
               FillComboBox();
               cmb3ameelname.Focus();
               Loadform = true;
               cmb3ameelname.SelectedItem = null;
               cmbLandTele.SelectedItem = null;
            }
        }

 private void backWork_DoWork(object sender, DoWorkEventArgs e)
        {
            CusLis = CustomerManger.SelectCustomersAll();
        }


void FillComboBox()
    {
      cmbameelname.DataSource = CusLis;
      cmbameelname.DisplayMember = "CustName";
     cmbameelname.ValueMember = "CustId";
   }

frm_load()
   {
       this.backWork.DoWork += new DoWorkEventHandler(this.backWork_DoWork);

        this.backWork.RunWorkerCompleted+=new RunWorkerCompletedEventHandler(this.backWork_RunWorkerCompleted);

      this.backWork.RunWorkerAsync();
   }

Protocol  Host                                   URL
HTTP     TUNNEL to                    subdomain-x.site.com/needed-page.html  <- My request
HTTP     TUNNEL to                    subdomain-y.site.com
:
.
HTTPS    subdomain-y.site.com some-url