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While demanding c++ language standard c++20, the error of OCCTProxy compilation is occured: warning C4857: C++/CLI mode does not support C++ versions newer than C++17; setting language to /std:c++17 error C7681: two-phase name lookup is not supported for C++/CLI or C++/CX; use /Zc:twoPhase- Officially, C++/CLI mode does not support C++ version newer than C++17, so we should not demand C++20 to compile csharp samples. Alternative solution - using /permissive (ConformanceMode = false), rather than default value /permissive- (ConformanceMode = true) option to compile OCCTProxy. But alternative solution has been denied. So, here is nothing to do to fix compilation of OCCTProxy project. Nevertheless, error occures in IE_WPF_WinForms and IE_WinForms - if we trying to compile with VC++ 2022 (not demanding c++20): warning MSB3274: The primary reference "*\OCCTProxy.dll" could not be resolved because it was built against the ".NETFramework,Version=v4.7.2" framework. This is a higher version than the currently targeted framework ".NETFramework,Version=v4.0". To solve the problem it is proposed to demand by default the highest version of NETFramework - 4.8. So, demanding NETFramework v4.8 does not crashing compilation of csharp samples with VC++ 2015.