If you decide to do a horizontal migration, the first choice you need to make is whether to migrate the presentation tier or the business tier first. Depending on which tier you choose to migrate, you will have a very different set of tasks to do, and pros and cons are associated with the decision. Let's look first at migrating the presentation tier.
Migrating the Presentation Tier
A horizontal migration of the presentation tier means to take all of your existing ASP code and convert it to use ASP.NET and/or to take all of your Visual Basic or MFC-rich clients and convert them to use Windows Forms as shown in Figure 12-7. In this migration scenario, the business tier remains as COM, MTS, or COM+ business objects. The client ...