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As someone who had to do this for a couple of clients, I can definitely say stay away from the conversion tools... they do not work!
If this software is critical to the company's business, I think you will have no option but to rewrite. Just hope that the current version works as is while you do that.
One thing I tried doing was to keep the UI same (or as similar as possible) so that users do not have to be re-trained a lot.
Happiness will never come to those who fail to appreciate what they already have. -Anon
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It's a while since I had to, but the conversion tool with Vis Studio 2003 worked fine for me, I copied the UI in VB.Net was told to make it as close as I could 'convert the old one, that worked' only had rough code behind buttons converted it and it worked (then I ran).
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So you want to go from VB6 to VB.NET? If you want to go from VB.NET to C# there is a host of problems which I encountered frequently... Have to do lots of things manually, even with code I wrote myself 
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The problem is VB.NET is your target. VB.NET is not getting any new features. There was a time when MS said they were developing VB.NET and C# side-by-side, with the same features between the two. That has since been killed. VB.NET is going to "wither on the vine" without new features.
I'm going to say your best bet is to rewrite from scratch in C# instead.
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It's safe to assume that people are not mentally challenged, and this is the first option that springs to their mind. But verry often, the time, resources and/or management's grasp of reality (or lack of) are preventing from going this path. Especially, when the purpose of the whole thing is just a small change in the current system.
Advertise here – minimum three posts per day are guaranteed.
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Dude, all I said was moving to VB.NET isn't really a good choice because of its limited lifetime. If a conversion to .NET (anything) was going to happen, a more appropriate target would be C#.
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Appropriate, sure. I am one that totally agrees with you as I once had to deal with a pile of VB6 and it is no fun at all.
As for getting signoff or access to resources or getting people to actually want to be forward thinking that are the final decision makers? This is a completely different issue and the bigger the company, expect the least ideal option being selected. And no it won't make sense. And yes, you will be frustrated greatly.
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There is no doubt that C# is a solid move, provided that is in your skillset. If not vb.net is not going away as fast as everyone says. It was supposed to be gone in 2010,2015, 2019, 2022 and there are still MANY that use it. I have a friend who converted all of his work to C# and started his own business and nearly all the work he does is vb.net, not conversions. just vb. So until everyone makes the switch it will exist and probably till the end of my lifetime.
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Is VB.NET the target? The OP isn't clear regarding that, although his statement can be taken that way. The wording indicates .NET Framework, not a newer version.
That said, I agree, C# is a better choice for the reasons you stated. At the time, VB.NET was a panacea for the extensive VB community, but as time has passed, so has the need for VB.NET, and MS has done less and less with it.
I'd target Framework 4.8.1 instead of a CORE release.
Why? Lifecycle. Framework has a lifespan as long as Windows contains it, which is 2029 for Win10, and I'm haven't checked for Win11.
Even versions (v6, v8) of CORE have a 3 year lifespan, while odd versions (v7) have an 18 month lifespan. That places an excessive burden on IT to update applications for which there is no business reason to update.
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Yeah, my preference is .NET web application if possible.
For desktop apps either Uno or .NET MAUI.
All in C#, of course.
I used to be fluent in VB.NET, but use it or lose it, and I'm not using it a lot anymore.
Of course the client gets to have a say in this too 
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The belief that MS is eventually going to kill off VB.Net is incorrect - but only because one person in MS said something incredibly misleading like, "We are no longer going to co-evolve VB.Net and C#."
The reality is that wherever VB.Net and C# are both language choices, MS will update both languages if a new substantive feature is added (except for .NET Framework 4.8). But if MS introduces something completely new, then C# will be the only language available. My thinking is that MS decided that, long term, they don't want to spend resources supporting two languages in every new 'platform' going forward forever. Minimizing duplicate work is a good business decision, and I think that C# was the 'winner' only due to perceived popularity. That decision would have been made several years ago.
The March 2023 TIOBE score rated VB.Net as the 6th most popular language, where C# is ranked 5th. In 2018 VB.Net was ranked 15th and C# was ranked 5th. C# has not moved in rank but VB.Net has moved up by 10 ranks. Hmmm - did MS really make the right choice? I think not.
See this site: TIOBE Index - TIOBE[^] Also, they use 'Visual Basic' for 'VB.Net' - you can read TIOBE's description of why they do this.
I am a VB.Net developer in WinForms. From what I can see - VB.Net is a better language. Not because one language allows for a better user experience - but because it allows for a better developer experience. The syntax is simpler, there's no need to type a semicolon at the end of every line of code, and there are no braces. Also, VB.Net does respect character capitalization in variables - a possible opportunity for error in C#. Does everyone remember KISS? VB.Net = KISS. All other things being equal you can finish an application faster using VB.Net than using C#. Anyone have customers? Customers will call you back for their next project if you can deliver faster. Have wallet? - Need customers!
Both languages compile to the .NET Runtime. They are actually so similar 'under the covers' that you can get an extension in Visual Studio to quickly convert from one language to the other. So why keep using the more difficult and time-consuming language?
Also, using .NET Framework 4.8 is a good choice for a long-term business app that needs solid stability and little maintenance. MS has stated, "As long as there is a Windows OS, there will be a .NET Framework 4.8." The Framework will receive Quality Updates and Security Updates, but not (or probably won't receive) Feature Updates. Winforms already has a long list of features that should satisfy most internal business applications. .NET Framework 4.8 might become the most stable platform available anywhere.
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Back in 2003, when I was first learning C#, an instructor said that Microsoft was going with VB.net for future improvements and that C# would not last long.
Similarly:
In 2012, Microsoft said that OLEDB was dead and there would not be future versions. Then in 2018 they admitted that OLEDB was too important die and they released a new version -- as I knew they would.
I find it best to ignore any prognostication.
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I migrate VB6 to VB.net and C#. It isn't as difficult as you think. Feel free to contact me by email.
ed
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Slow Eddie wrote: Feel free to contact me by email.
How?
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Here is a step-by-step instruction how to install VB6 on Win10. The instructions actually work. And you can find the two CDs with VB in MSDN. It took me a while to get to this information:
Visual Basic Discussion Boards[^][^]
In MSDN search for: "Visual Basic 6.0 Enterprise "
The Visual Basic forum was more aggressive than helpful on the subject, but here is the link: Visual Basic Discussion Boards[^]
Advertise here – minimum three posts per day are guaranteed.
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Sander Rossel wrote: I know there used to be converter tools around, but I've heard bad things about them.
They're usually not worth the effort.
You don't want a converter. There were tools that let yuo integrate .NET into a VB6 app.
Interop Forms Toolkit 2.0 Tutorial[^]
A company I worked for tried a rewrite, and I was specifically told not to go the "slow transition route" by the software lead because it might kill the rewrite. That decision killed the company.
You rewrite critical parts. In a year, the VB6 crap will merely exist to display .NET modules. Then you start a new .NET host for those modules.
Before you do that, you'd want to migrate the database to something that makes more sense.
Yup, been there, got the TShirt. Go slow and steady. DB first, then VB a small victory at a time.
Bastard Programmer from Hell 
"If you just follow the bacon Eddy, wherever it leads you, then you won't have to think about politics." -- Some Bell.
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Eddy Vluggen wrote: Before you do that, you'd want to migrate the database to something that makes more sens
That would have been my suggestion also.
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Having done exactly what you are asking about, here is how I approached the problem.
0: Strip all the code from your forms.
1: Use the converter from VB 2008 to upgrade the forms. (UI only)
2: Paste back in the code, proc by proc, fixing it as you go.
It's a long, slow, boring process.
There's also a company called mobilize.net that I've looked into that seem to do a really good job at migrating VB6 to .Net. Good luck! 
"Go forth into the source" - Neal Morse
"Hope is contagious"
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Sounds like a good time to also review the overall design, make more modular, do some TDD/unit tests, etc.
Sell them on positives....
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My experience is to create the new dotNet VB application from scratch. Use the VB6 source as a guide to what needs to be done. In some cases, I discovered that if I copy/paste the VB6 source into the project and then fix that source it worked wonders.
Gotchas:
- File IO - classic VB file handling is there, but using the new StreamReader and StreamWriter classes are far more efficient
- Event handlers, but at least VB.Net makes these explicit in the code. The order of event firing is different from VB6.
- Error handling: You can leave in the VB6 error handling but I strongly recommend you switch to the Try Catch Finally End Try constructs. I have a few short Subs and Functions where I legitimately use On Error Resume Next, but I document why I'm using this construct.
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look at this post, it may give your ideas...
diligent hands rule....
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You are better off leaving the existing application as VB6 and just do the change to the database layer, VB6 still works perfectly and will continue to do so for a long time.
Then just develop new features in .net when required.
We spent about 5 man years converting one of our applications to VB.Net and now its just as (not)supported by Microsoft as VB6.
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Interesting answer. Really depends on a system analysis but you could be right. That said, VB6 is slated to possibly bite the dust in 10 or so years. Better long-term planning might be to gradually move it to some other platform. It's pretty easy to maintain DB compatibility with multiple platforms.
I don't see VB.net "just as not supported by MS" at all. I'm not saying I wouldn't choose something different, but VB support in VS22 seems to be pretty solid.
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Member 15966771 wrote: VB6 still works perfectly and will continue to do so for a long time.
It works, but that's all you can say about it.
Development and installation are a pain compared to modern solutions.
There also aren't too many developers who are willing to maintain and develop old VB6 applications, especially this one.
Besides, it works because it works for as long as it works.
If Microsoft pulls the plug, which they officially did in 2008, 15(!) years ago, this company can file for bankruptcy.
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