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I have a piece of code contained in a function that is duplicated in a VB.NET project and VB6 project. Long term the VB6 project will be phased out. However, short term I want the VB6 project to call the VB.NET function. I see a number of options:

1) Add VB.NET reference to VB6 project
2) Expose the VB.NET functionality to the VB6 project via a web service

Performance is important. I am trying to decide the best option.

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    Check this out: stackoverflow.com/questions/2253875/… Commented Apr 7, 2014 at 18:18
  • The Web Service route wouldn't require you to ensure COM compatibility for your .NET assembly. Commented Apr 7, 2014 at 18:59

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You can use vb.net to make a COM dll and call it from VB6. Here's an example (older; vs2005):

http://www.codeproject.com/Articles/28591/Creating-a-COM-DLL-with-VS-A-Walkthrough

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I think that you have several options: 1) Web Service (performance will be affected because of the serialization or deserialization of parameters) 2) Expose functionality using COM or COM+ 3) Or if you need to use a VB.NET UserControl you can use the Forms Interop Toolkit (nice article on code project https://www.codeproject.com/Articles/18954/%2FArticles%2F18954%2FInterop-Forms-Toolkit-2-0-Tutorial) 4) I have not verified this option but you might be able to also use XAML islands

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