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I have a really large VB6 code base with a ton of 3rd party controls. Want to move it to .NET. Rewriting it is out of question – the client sees no value in spending money to get the same thing. Moving to .NET with the built-in upgrade wizard is basically a non-starter.
Has anyone tried the VB Migration Partner from http://www.vbmigration.com/ If so, what have been the experiences like?
I am the lead author of the VB Migration Partner tool (featured at http://www.vbmigration.com). In general we answer very quickly to all requests coming from existing or potential customers. I am sorry if found it difficult to contact us. Please try again at http://www.vbmigration.com/contactus.aspx
We do believe that our tool is capable to tackle very large VB6 applications. Actually, most of our customers are using it to migrate applications in the range 200-500K lines of code. We are currently working on a ‘monster app’ of over 13 millions LOCs partitioned in 1200+ projects.
As RSConley suggests, any conversion tool works best if your application can be migrated and tested in parts. We support VB6 project groups (that are converted in a single operation), batch conversions, and we support integration with source code control tools. (For example, we preserve solution/project guids from previous generation, so that your SC tool knows how to deal the newly generated code.)
Finally, we are about to release version 1.11, which can generate .NET DLLs that are binary compatible with the original COM DLLs, so that you can migrate one component at the time starting with the most basic ones that are used by all others portions of your app, without having to re-compile them. (As far as we know, VB Migration Partner is the only tool with this feature.)
Francesco Balena — VB Migration Partner Team