Geeks With Blogs
Bill Osuch - Random geek notes eBay
New web site launched
I’ve written a few posts about working with the eBay API, and I’ve been using it a bit as a part-time seller, so I decided to make the tool I wrote available to anyone. The site is called Listing Trends (, and it allows potential sellers to research what is currently hot on eBay. You can drill into individual categories and view the tops results by highest number of watchers, bidders, or the highest price. There are also pages that show listings with a low Buy-It-Now, or listings ......

Posted On Thursday, September 5, 2013 2:09 PM

How to preserve state across pages in a Windows 8 app
When designing a Windows 8 app, you need a way to preserve the state of various items as you navigate from page to page. Windows allows this using the pageState dictionary - a dictionary that can contain any serializable object. If you're a web programmer, you can think of this as similar to using a session variable. Today I'll add this to the cascading ListBoxes shown earlier. You can download the code for that project at First, we'll add a navigation button to the page. Put ......

Posted On Friday, January 4, 2013 11:58 AM

Using cascading ListBoxes to display hierarchical data in Windows 8
When you're dealing with hierarchical data (a tree-like data format such as folders that have sub-folders that have subfolders, etc.) you have to come up with an organized way of displaying it. You could create a tree view, similar to how Windows Explorer displays folders, but I wanted to try something different in Windows 8 - cascading ListBoxes. The user selects an items in a ListBox, and then a new ListBox appears to the right showing the sub-categories. This continues as long as there's data ......

Posted On Thursday, December 20, 2012 2:28 PM

Retrieving a list of eBay categories in a .Net 4.5 Windows Store App
Previously I wrote a post on how to get the eBay category list using their .Net SDK. I wanted to try doing the same thing in a Windows Store App for Windows 8 using Visual Studio 2012, but quickly ran into compatibility problems since the DLLs are compiled for .Net 2.0. I could have either changed the targetted framework, or attempted to re-write the DLLs, but neither sounded particularly exciting, so I simply decided to fall back to using a simple URL request and parsing it via Linq to XML. As mentioned ......

Posted On Wednesday, December 19, 2012 11:18 AM

Retrieving a list of eBay categories using the .NET SDK and GetCategoriesCall
eBay offers a .Net SDK for its Trading API - this post will show you the basics of making an API call and retrieving a list of current categories. You'll need the category ID(s) for any apps that post or search eBay. To start, download the latest SDK from and create a new console app project. Add a reference to the eBay.Service DLL, and a few using statements: using eBay.Service.Call; using eBay.Service.Core.Sdk; using eBay.Service.Core.Soap; ......

Posted On Monday, June 25, 2012 2:06 PM

Copyright © Bill Osuch | Powered by: