Creating Virtual Directory

I am working in installer. I need to create one application/Virtual Directory under my own "MySite" . it is not under "Default Web Site". following are code using for same..But I am unable to create. My requirement is as below in IIS.

sites

       MySite

            TestApp

                 reports

      Default Web Site.

           asp-net

My requirement is to create TestApp entry and Virtual directory for this under MySite. I am able to create under Default Web Site but unable to create under MySite. Can anybody please suggest ?

physicalPath = "AM\\MH"

virtualpath = "TestApp"

altVirtualPath = "reports"

HRESULT CreateIIS7VirtualDirectory(BSTR physicalPath, BSTR virtualPath, BSTR altVirtualPath)
{
CComPtr<IAppHostWritableAdminManager> adminManager;
HRESULT hr = adminManager.CoCreateInstance(__uuidof(AppHostWritableAdminManager));

if(FAILED(hr))
return hr;

CComBSTR sitesSection("system.applicationHost/sites");
CComBSTR path("MACHINE/WEBROOT/APPHOST/MySite");

CComPtr<IAppHostElement> sitesElement;
hr = adminManager->GetAdminSection(sitesSection, path, &sitesElement);

CComPtr<IAppHostElement> siteElement;
hr = GetSiteElement(sitesElement, siteElement);

CComPtr<IAppHostElementCollection> applications;
hr = siteElement->get_Collection(&applications);

CComPtr<IAppHostElement> application;
hr = GetApplicationElement(virtualPath, applications, application);

hr = SetApplicationVirtualDirectory(application, physicalPath, CComBSTR("/"));

SetApplicationVirtualDirectory(application, physicalPath, altVirtualPath);

hr = adminManager->CommitChanges();

SetApplicationPermissions(virtualPath);

return S_OK;
}