Copied your code and did just one change below and got "Codetext found: OB|090547db800b6c47" output.
Console.WriteLine("Codetext found: " + barcodeReader.GetCodeText());
I used Aspose.BarCode for .NET version 5.5 in a .NET 4.5 project. Which version are you using?
PS. I am a Developer Evangelist at Aspose.