public void Handle(AddApplication command)
{
command.ThrowIfNull(GetType().Name);
var site = _siteFacade.GetSite(command.SiteName);
site.ThrowIfNull(command.SiteName);
var applicationPool = _applicationPoolFacade.GetApplicationPool(command.ApplicationPoolName);
applicationPool.ThrowIfNull(command.ApplicationPoolName);
var application = _applicationFacade.GetApplication(command.ApplicationName, site);
application.ThrowIfExists();
_applicationFacade.AddApplication(command.ApplicationName, command.PhysicalPath, command.ApplicationPoolName, site);
}