According to sunblognuke website, As you know, the simple method GetTab(int tabid) was obsolete and has been replaced by GetTab(ByVal TabId As Integer, ByVal PortalId As Integer, ByVal ignoreCache As Boolean). If you want to call the new method, we have to pass the additional parameter “PortalId”.

In common,  the object PortalSettings can be easy to get with DNN context, such as special dnn module & page; however, it may be inaccessible in some sceneries, such as separate aspx page or handler. Then is there any way to get the correct tab info with this new method? Now there is a simple trick to do it with passing into Null.NullInteger as the parameter PortalId. So the coding looks like that:

var tabController = new TabController();
var blogPage = tabController.GetTab(tabID, Null.NullInteger, false);

Deeping into the source code, you will find out that it always tries to get the correct PortalId for this tab/page object:

//if we do not know the PortalId then try to find it in the Portals Dictionary using the TabId
portalId = GetPortalId(tabId, portalId);

//if we have the PortalId then try to get the TabInfo object
tab = GetTabsByPortal(portalId).WithTabId(tabId) ??
        GetTabsByPortal(GetPortalId(tabId, Null.NullInteger)).WithTabId(tabId);

Hope this trick & tip helps if someone has the same issue.

Best Recommended DotNetNuke Hosting

ASPHostPortal.com is the leading provider of Windows hosting and affordable DotNetNuke Hosting. DotNetNuke Hosting from ASPHostPortal.com provides a safe, reliable and performance-driven foundation for your DotNetNuke website. DotNetNuke is the perfect Content Management System for managing and developing your website with one of ASPHostPortal’s Hosting plans. ASPHostPortal has ability to support the latest Microsoft and ASP.NET technology, such as: WebMatrix, WebDeploy, Visual Studio 2015, .NET 5/ASP.NET 4.5.2, ASP.NET MVC 6.0/5.2, Silverlight 6 and Visual Studio Lightswitch, ASPHostPortal guarantees the highest quality product, top security, and unshakeable reliability, carefully chose high-quality servers, networking, and infrastructure equipment to ensure the utmost reliability.