Some bits of a Visual Basic 6 application, like most APIs, can be easily migrated to VB.NET; other parts are not so straightforward. Which of the following will NOT have to be re-architected during a VB 6-to-VB.NET migration?
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DHTML pages
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ActiveX documents
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OLE controls
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ADO to ADO via Interop
ADO can be used in VB.NET via COM Interop without re-architecting - the .NET framework provides COM interopability to call legacy components. DHTML pages, ActiveX documents, and OLE controls are deeply tied to VB6's runtime model and have no direct .NET equivalents - they require architectural redesign or replacement.
To answer this question, it is important to understand the differences between Visual Basic 6 (VB 6) and Visual Basic .NET (VB.NET) and the migration process from VB 6 to VB.NET.
VB 6 and VB.NET are two different programming languages, and migrating a VB 6 application to VB.NET often requires re-architecting or modifying certain parts of the application to make it compatible with the newer language and framework.
Let's go through each option to determine which one will NOT have to be re-architected during a VB 6-to-VB.NET migration:
A. DHTML pages - DHTML (Dynamic HTML) pages are typically used for creating interactive web content. VB 6 does not have built-in support for DHTML, so if a VB 6 application is using DHTML pages, those pages would likely need to be re-architected or modified during the migration process. Therefore, this option will have to be re-architected during a VB 6-to-VB.NET migration.
B. ActiveX documents - ActiveX documents are components that can be embedded within other applications. VB 6 supports ActiveX documents, but the implementation may differ in VB.NET. Depending on the specific usage and implementation of ActiveX documents in the VB 6 application, they may need to be re-architected during the migration process. Therefore, this option will have to be re-architected during a VB 6-to-VB.NET migration.
C. OLE controls - OLE (Object Linking and Embedding) controls are used to embed or link objects within an application. VB 6 supports OLE controls, but the implementation may differ in VB.NET. Depending on the specific usage and implementation of OLE controls in the VB 6 application, they may need to be re-architected during the migration process. Therefore, this option will have to be re-architected during a VB 6-to-VB.NET migration.
D. ADO to ADO via Interop - ADO (ActiveX Data Objects) is a data access technology used in VB 6 for accessing databases. In VB.NET, ADO has been replaced by ADO.NET. However, VB.NET provides Interop libraries that allow you to use ADO in a VB.NET application. Therefore, if the VB 6 application is using ADO and you choose to use ADO via Interop in the VB.NET application, you would not have to re-architect the ADO-related parts of the application. This is the correct answer.
In conclusion, the option that will NOT have to be re-architected during a VB 6-to-VB.NET migration is D) ADO to ADO via Interop.