Declare types in namespaces (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1050)

Remove the underscores from member name WMessages.WM_MOUSEMOVE (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1707)

Declare 'WMessages' inside namespace. (http://pihrt.net/roslynator/analyzer?id=RCS1110)

Remove the underscores from member name WMessages.WM_LBUTTONDOWN (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1707)

Sort 'WMessages' members. (http://pihrt.net/roslynator/analyzer?id=RCS1154)

Remove the underscores from member name WMessages.WM_LBUTTONUP (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1707)

Remove the underscores from member name WMessages.WM_RBUTTONDOWN (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1707)

Remove the underscores from member name WMessages.WM_KEYDOWN (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1707)

Remove the underscores from member name WMessages.WM_RBUTTONUP (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1707)