Using directives must be placed outside of a namespace declaration (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/style-rules/ide0065)

Constant fields should appear before non-constant fields (https://github.com/DotNetAnalyzers/StyleCopAnalyzers/blob/master/documentation/SA1203.md)

Partial elements should be documented (https://github.com/DotNetAnalyzers/StyleCopAnalyzers/blob/master/documentation/SA1601.md)

Move pinvokes to native methods class (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1060)

Possible null reference assignment.

Non-nullable event 'Opened' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the event as nullable.

Non-nullable event 'Opened' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the event as nullable.

Non-nullable event 'Opened' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the event as nullable.

Possible null reference return.