The following are some suggested supplemental references to further your retraining effort.
Executive Summary for Fujitsu's NetCOBOL for .NET:
http://www.netcobol.com/products/pdf/0602_EXSUM-NetCOBOL-NET.pdf
Fujitsu NetCOBOL for .NET:
http://www.netcobol.com/products/ windows /netcobol.html
IBuySpy Store Application (sample application in COBOL .NET):
http://www.ibuyspycobol.com/
IBuySpy Store Application (sample application in VB .NET and C#):
http://www.ibuyspystore.com/
Intensity Software's NetCOBOL Samples (provided by Fujitsu Software and Intensity Software):
http://www.netcobolsamples.com/