Cannot progammatically change IIS website's physical path

Question

I'm trying to change the path to some of my IIS sites programmatically. The change only takes effect only for one of the sites (the same one) and not all of them. Can anyone see what I am doing wrong here?

using WebAdministration = Microsoft.Web.Administration;

using (WebAdministration.ServerManager serverManager = new WebAdministration.ServerManager())
{
    serverManager.Sites.ToList().ForEach(site =>
    {
        site.Stop();
        serverManager.CommitChanges();
        //ChangeDirectoryOfSite(site
        site.Applications.ToList().ForEach(app =>
        {
            //ChangeDirectoryOfApplication
            //if (app.VirtualDirectories?.Attributes["path"]?.Value...
            app.VirtualDirectories.Attributes["path"].Value = ...
            //if (app.VirtualDirectories?.Attributes["physicalPath"]?.Value?
            app.VirtualDirectories.Attributes["physicalPath"].Value = ...
            app.VirtualDirectories.ToList().ForEach(virtualDir =>
            {
                //ChangeDirectoryOfVirtualDirectoy
                //if (virtualDir.Attributes["path"].Value...
                virtualDir.Attributes["path"].Value = ...
                //if (virtualDir.Attributes["physicalPath"].Value...
                virtualDir.Attributes["physicalPath"].Value = ...
            }
            site.Start()
        }
        serverManager.CommitChanges();
    }
}

Answer 1

The answer was to .CommitChanges() after each value change:

I marked the code changes with // <-- Add this below

using WebAdministration = Microsoft.Web.Administration;

using (WebAdministration.ServerManager serverManager = new WebAdministration.ServerManager())
{
    serverManager.Sites.ToList().ForEach(site =>
    {
        site.Stop();
        serverManager.CommitChanges();
        //ChangeDirectoryOfSite(site
        site.Applications.ToList().ForEach(app =>
        {
            //ChangeDirectoryOfApplication
            //if (app.VirtualDirectories?.Attributes["path"]?.Value...
            app.VirtualDirectories.Attributes["path"].Value = ...
            serverManager.CommitChanges(); // <--- Add this
            //if (app.VirtualDirectories?.Attributes["physicalPath"]?.Value?
            app.VirtualDirectories.Attributes["physicalPath"].Value = ...
            serverManager.CommitChanges(); // <--- Add this
            app.VirtualDirectories.ToList().ForEach(virtualDir =>
            {
                //ChangeDirectoryOfVirtualDirectoy
                //if (virtualDir.Attributes["path"].Value...
                virtualDir.Attributes["path"].Value = ...
                serverManager.CommitChanges(); // <--- Add this
                //if (virtualDir.Attributes["physicalPath"].Value...
                virtualDir.Attributes["physicalPath"].Value = ...
                serverManager.CommitChanges(); // <--- Add this                
            }
            site.Start()
        }
        serverManager.CommitChanges();
    }
}