Clean up events docs

[adegeo]

Summary

• Move code to appropriate folders
• Clean up terminology
• Scrub references to ASP.NET/WinForms as the baseline way to describe events
• Change how-to articles to property procedural articles that give people steps to implement something
• Rewrote the "declaring event property" example to a scenario that suits the purpose of event properties

Fixes #45772

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Internal previews

📄 File	🔗 Preview link
docs/fundamentals/toc.yml	docs/fundamentals/toc
docs/standard/events/how-to-declare-multiple-events-using-event-properties.md	Declare multiple events using event properties
docs/standard/events/how-to-raise-and-consume-events.md	"Raise and consume events"
docs/standard/events/index.md	docs/standard/events/index

[Copilot]

Pull request overview

Updates the .NET events documentation set to use more generic, modern examples and relocates/refreshes code snippets to align with the updated guidance (removing older ASP.NET/Windows Forms–centric framing).

Changes:

• Replace legacy events examples with generic .NET examples and update related links across the events landing page and how-to articles.
• Move/replace snippet sources into docs/standard/events/snippets/... and wire articles to them via :::code includes.
• Remove obsolete sample files that referenced System.Windows.Forms.

Reviewed changes

Copilot reviewed 27 out of 27 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
samples/snippets/visualbasic/VS_Snippets_CLR/conceptual.events.other/vb/example3.vb	Removes legacy WinForms-based event-properties sample.
samples/snippets/csharp/VS_Snippets_CLR/conceptual.events.other/cs/example3.cs	Removes legacy WinForms-based event-properties sample.
docs/standard/events/snippets/index/vb/eventsVB.vbproj	Adds VB snippet project for the events index page.
docs/standard/events/snippets/index/vb/Program.vb	Adds VB handler-subscription snippet for the events index page.
docs/standard/events/snippets/index/vb/EventExample.vb	Adds VB event/delegate/event-args snippets for the events index page.
docs/standard/events/snippets/index/csharp/eventsCS.csproj	Adds C# snippet project for the events index page.
docs/standard/events/snippets/index/csharp/Program.cs	Adds C# handler-subscription snippet for the events index page.
docs/standard/events/snippets/index/csharp/EventExample.cs	Adds C# event/delegate/event-args snippets for the events index page.
docs/standard/events/snippets/how-to-raise-and-consume-events/vb/vb.vbproj	Adds VB snippet project for “Raise and consume events”.
docs/standard/events/snippets/how-to-raise-and-consume-events/vb/Program.vb	Empty entry-point placeholder file (VB).
docs/standard/events/snippets/how-to-raise-and-consume-events/vb/EventWithDelegate.vb	Adds VB example for events using a custom delegate.
docs/standard/events/snippets/how-to-raise-and-consume-events/vb/EventWithData.vb	Adds VB example for events carrying custom event data.
docs/standard/events/snippets/how-to-raise-and-consume-events/vb/EventNoData.vb	Adds VB example for events without event data.
docs/standard/events/snippets/how-to-raise-and-consume-events/csharp/csharp.csproj	Adds C# snippet project for “Raise and consume events”.
docs/standard/events/snippets/how-to-raise-and-consume-events/csharp/Program.cs	Empty entry-point placeholder file (C#).
docs/standard/events/snippets/how-to-raise-and-consume-events/csharp/EventWithDelegate.cs	Adds C# example for events using a custom delegate.
docs/standard/events/snippets/how-to-raise-and-consume-events/csharp/EventWithData.cs	Adds C# example for events carrying custom event data.
docs/standard/events/snippets/how-to-raise-and-consume-events/csharp/EventNoData.cs	Adds C# example for events without event data.
docs/standard/events/snippets/how-to-handle-multiple-events-using-event-properties/vb/Sensor.vb	Adds VB EventHandlerList-backed event-properties sample.
docs/standard/events/snippets/how-to-handle-multiple-events-using-event-properties/vb/Program.vb	Adds VB subscription/handler snippet for event properties sample.
docs/standard/events/snippets/how-to-handle-multiple-events-using-event-properties/vb/EventProperties.vbproj	Adds VB snippet project for event-properties how-to.
docs/standard/events/snippets/how-to-handle-multiple-events-using-event-properties/csharp/Sensor.cs	Adds C# EventHandlerList-backed event-properties sample.
docs/standard/events/snippets/how-to-handle-multiple-events-using-event-properties/csharp/Program.cs	Adds C# subscription/handler snippet for event properties sample.
docs/standard/events/snippets/how-to-handle-multiple-events-using-event-properties/csharp/EventProperties.csproj	Adds C# snippet project for event-properties how-to.
docs/standard/events/index.md	Updates events landing page examples and links; switches to :::code includes.
docs/standard/events/how-to-raise-and-consume-events.md	Rewrites how-to with step-based structure and new snippet includes.
docs/standard/events/how-to-handle-multiple-events-using-event-properties.md	Rewrites how-to with new Sensor-based sample and snippet includes.

[BillWagner]

This LGTM. I had one optional suggestion.