Rewrite autoscale article to reflect modern .NET DPI handling

[Copilot]

Summary

Rewrites the autoscale.md article to document modern .NET (6-9) DPI awareness configuration instead of .NET Framework's AutoScaleMode approach.

Fixes issue about article reflecting outdated .NET Framework DPI behavior.

Key Changes

Content restructure:

• Lead with ApplicationHighDpiMode project property and Application.SetHighDpiMode() API
• Document all HighDpiMode enum values (PerMonitorV2, SystemAware, PerMonitor, DpiUnaware, DpiUnawareGdiScaled)
• Add runtime DPI change event handling section
• Move legacy AutoScaleMode content to separate section marked for .NET Framework compatibility

Configuration examples:

Project file approach (recommended):

<PropertyGroup>
  <ApplicationHighDpiMode>PerMonitorV2</ApplicationHighDpiMode>
</PropertyGroup>

Code-based approach:

ApplicationConfiguration.Initialize();
Application.SetHighDpiMode(HighDpiMode.PerMonitorV2);
Application.Run(new Form1());

Style guide compliance:

• Active voice throughout
• Imperative mood for instructions
• Contractions where appropriate
• Simplified technical phrasing
• Added ai-usage: ai-assisted frontmatter

Original prompt

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This section details on the original issue you should resolve

<issue_title>Rewrite autoscale article to reflect current DPI settings</issue_title>
<issue_description>### Type of issue

Typo

Description

This article needs a rewrite. It currently reflects how DPI is working in .NET Framework and not in .NET 9+.

Page URL

https://learn.microsoft.com/en-us/dotnet/desktop/winforms/forms/autoscale?view=netdesktop-9.0

Content source URL

https://github.com/dotnet/docs-desktop/blob/main/dotnet-desktop-guide/net/winforms/forms/autoscale.md

Document Version Independent Id

1aaf7424-82fb-ad59-b088-8ba2390fcd8c

Platform Id

f8ee52a9-4357-d487-4c01-bf6ae2a7feaf

Article author

@adegeo

Metadata

• ID: 6bdfb610-861b-9a50-5a81-3416ec1d9cdc
• PlatformId: f8ee52a9-4357-d487-4c01-bf6ae2a7feaf
• Service: dotnet-desktop
• Sub-service: winforms

Related Issues</issue_description>

Comments on the Issue (you are @copilot in this section)

Custom agent used: Documentation Editor
Edit and transform a document using the Microsoft Style Guide

• Fixes Rewrite autoscale article to reflect current DPI settings #2063

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Internal previews

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dotnet-desktop-guide/winforms/forms/autoscale.md	dotnet-desktop-guide/winforms/forms/autoscale

[Copilot]

Pull Request Overview

This PR modernizes the autoscale.md article to document .NET 6-9 DPI awareness configuration, replacing outdated .NET Framework content. The rewrite addresses user feedback that the article incorrectly reflected .NET Framework behavior instead of modern .NET DPI handling.

Key changes:

• Introduces ApplicationHighDpiMode project property and Application.SetHighDpiMode() as the primary DPI configuration approach
• Documents all HighDpiMode enumeration values with clear guidance on when to use each
• Adds runtime DPI change event handling section covering DpiChanged, DpiChangedBeforeParent, and DpiChangedAfterParent events
• Relocates legacy AutoScaleMode content to a separate section marked for .NET Framework compatibility

[Copilot]

The list items in the DPI awareness modes section should end with periods since they exceed three words per the Markdown style guidelines. All five mode descriptions (PerMonitorV2, SystemAware, PerMonitor, DpiUnaware, DpiUnawareGdiScaled) need periods added at the end.

[Copilot]

The list items describing DPI change events should end with periods since they exceed three words per the Markdown style guidelines. All three event descriptions need periods added at the end.

[Copilot]

The list items describing scaling customization methods should end with periods since they exceed three words per the Markdown style guidelines. All three method descriptions need periods added at the end.