Add SOAP header before the WebService request (Windows Forms)

Question

I have to add this header before my Request:
<h:FordDealerIdentity xmlns:h="urn:ford/star/security/v1.0" xmlns="urn:ford/star/security/v1.0">
<soapenv:Header>
<SiteCode>SZBRA</SiteCode>
</soapenv:Header>
</h:FordDealerIdentity>
My request:
var srv = new ConsumerServiceScheduleV1();
var a = new RetrieveScheduleRequestType();
var b = new DealerType();
var c = new ScheduleType();
srv.Credentials = new System.Net.NetworkCredential("","SZBRA05168");
//ScheduleType[] ret;
b.Code = 05168;
b.Name = "BraconCampos";
a.Dealer = b;
a.SchedulingFrom = new DateTime(10/10/2014);
a.SchedulingTo = new DateTime(15/10/2015);
c.SchedulingCategory = SchedulingCategoryType.Regular;
srv.ClientCertificates.Add(new System.Security.Cryptography.X509Certificates.X509Certificate2(@"E:\Agenda Ford\Certificados Agend@Ford\BracomCampos.pfx", "qaz123"));
textBox1.Text = srv.RetrieveSchedule(a).ToString();

Answer 1

Is Windows Forms! :)
And what forum deals with SOAP and Web services more than any other forum?  Many types of client based applications such as  Windows form, WPF, Sliverlight, Windows service classlib project like a BLL and so forth deal sith SOAP and WEB.
How is what you are talking about a Windows forms issue?
My Application is Windows Forms. I need to know how to insert this header before request.