Hi Christoph,
I think you have copied the sample and run it in another place. In the sample MDB file address is hardcoded. Since solution file folder location changed, the MDB file location is not addressed properly. Herewith I have attached the sample. In this I have added the MDB in it solution folder. Please refer to the sample and let me know if it helps you.
F57313.zipThank you for using Syncfusion products.
Regards,
Murugan P.S