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Showing posts from August, 2007

Programmatically Accessing Excel Data via .NET on 64-bit servers

So it turns out that using ADO.NET to access MS Excel worksheet data in an ASP.NET application running on the 64-bit version of Windows Server 2003 does not quite work as expected. This also goes for any 64-bit .NET code. In short, the Microsoft.Jet.OLEDB.4.0 provider is a 32-bit driver that does not work when directly used by 64-bit code. The following post from a Microsoft employee describes the issue:

Connect to Excel. Using x64 (64-bit) platform. Compiled as x64

"Since there are no 64-bit OleDb drivers for anything other than SQL Server, therefore, we cannot write 64-bit apps which interface with databases directly.

What you need to do is split your application into a 32 bit part and a 64 bit part, use COM interop to cross the 64/32 bit boundary. For instance, drop the code (just a simple class library compiled as 32 bit) that retrieves the Excel data into a COM+ (System.EnterpriseServices) as a "server type" application, and call those server methods from your 64 b…

Using Log4Net in 4 Simple Steps

First off, yes, this is a complete rip-off from this blog post, but with value added in that this represents my personal preference when using log4net. This is a simple four step process of adding logging to an application. I prefer log4net over the MS logging application block, primarily as log4net has zero dependencies and NHibernate already references it. IMHO, if you're doing ANY kind of logging, reference log4net into your project and use it instead of Trace.WriteLine() or Debug.WriteLine().
Step 1. Add the following in the AssemblyInfo.cs[assembly: log4net.Config.XmlConfiguratorAttribute(
ConfigFile = "log4net.xml", Watch = true)]
Step 2. Create the log4net.xml file and add the following to the new fileWith respect to the location of this file and SharePoint, this file can exist in the root of the wss root, next to the relevant web.config file for the given site.In general, this should sit next to the app.config or web.config file for the g…