多次使用AutoResetEvent

我在。net 4.0 c#应用程序中有两个异步调用一个web服务。这些是通过使用AutoResetEvent WaitOne()来控制的。

在我的本地机器上，这是按预期工作的。但是当我将它部署到服务器中时，在第一次调用中调用第二步的成功处理程序。

需要做什么改变才能使线程正常运行?

if (userID != null)
{
    AddressBookRequest req = new AddressBookRequest
    {
        contactsSearchCriteria = new ContactsSearchCriteria
        {
            searchUserID = userID.Trim()
        },
        HeaderParams = new HttpHeaderParms
        {
            UserId = userID.Trim(),
            UserPrincipalName = userID.Trim() ,
            ContentType = "application/xml"
        }
    };
    lookupServicesAssociate.SearchContactDetailsAsync(req);
    autoRestEvent = new AutoResetEvent(false);
    lookupServicesAssociate.SearchContactDetailsCompleted +=
        new EventHandler<ServiceResponseEventArgs<ContactDetailsPreview[]>>(AssociateSearchContactDetailsCompleted);
    autoRestEvent.WaitOne();
}
if (reportsToUserID != null)
{
    AddressBookRequest req1 = new AddressBookRequest
    {
        contactsSearchCriteria = new ContactsSearchCriteria
        {
            searchUserID = reportsToUserID.Trim()
        },
        HeaderParams = new HttpHeaderParms
        {
            UserId = reportsToUserID.Trim(),
            UserPrincipalName = reportsToUserID.Trim(), 
            ContentType = "application/xml"
        }
    };
    lookupServiceReports.SearchContactDetailsAsync(req1);
    lookupServiceReports.SearchContactDetailsCompleted +=
        new EventHandler<ServiceResponseEventArgs<ContactDetailsPreview[]>>(ReportsToAssociateSearchContactDetailsCompleted);
    autoRestEvent.WaitOne();
}