Migrating an application from C, C++ to .NET is the challenge which misoft systems together with AIT AG meet within a long-term cooperation which started at the end of the last year. The end customer is the German company Anton Paar Germany GmbH and the application is used for preparing, carrying out, analyzing and presenting measurements in the field of Rheology with measurement devices produced by the customer. Redesigning the architecture as well as implementing new functionalities is necessary for migrating the application.