Forum Discussion

Copper Contributor

Jun 13, 2022

.NET 6 migration

Hi all, During migration of our existing project targeting .NET framework 4.8 we encountered starnge error: MC1000 Unknown build error, 'Could not find type 'System.Web.PreApplicationStartMethodAtt...

Windows Forms

WPF

LanHuang

Former Employee

Jun 15, 2022

Hi filio_,

Thanks for posting your issue here.

However this platform is used for how-to discussions and sharing best practices for building any app with .NET.Since your issue is a technical question, welcome to post it in Microsoft Q&A forum, the support team and communities on Microsoft Q&A will help you for any technical questions.
Besides, it will be appreciated if you can share it here once you post this technical question Microsoft Q&A.
Best Regards,
Lan Huang

filio_

Copper Contributor

Jun 15, 2022

LanHuang I've posted there already, but does not have answer from them yet.

Meanwhile I figured out that it was problem with mixing APS.NET components with WinForm and WPF controls within one library assembly. So solution to this was isolate ASP.NET components from WinForm and WPF components.