[UUF] Add missing code snippets

[gewarren]

(Hide whitespace changes.)

[learn-build-service-prod]

Learn Build status updates of commit 22cd717:

✅ Validation status: passed

File	Status	Preview URL	Details
snippets/csharp/VS_Snippets_CFX/s_ueexceptionhandler/cs/program.cs	✅Succeeded	View
xml/System.ServiceModel.Dispatcher/ExceptionHandler.xml	✅Succeeded	View

For more details, please refer to the build report.

For any questions, please:

• Try searching the learn.microsoft.com contributor guides
• Post your question in the Learn support channel

[learn-build-service-prod]

Learn Build status updates of commit 61aebb3:

✅ Validation status: passed

File	Status	Preview URL	Details
snippets/csharp/VS_Snippets_CFX/s_ueexceptionhandler/cs/app.config	✅Succeeded
snippets/csharp/VS_Snippets_CFX/s_ueexceptionhandler/cs/cs.csproj	✅Succeeded
snippets/csharp/VS_Snippets_CFX/s_ueexceptionhandler/cs/makefile	✅Succeeded	n/a (file deleted or renamed)
snippets/csharp/VS_Snippets_CFX/s_ueexceptionhandler/cs/program.cs	✅Succeeded	View
xml/System.ServiceModel.Dispatcher/ExceptionHandler.xml	✅Succeeded	View

For more details, please refer to the build report.

For any questions, please:

• Try searching the learn.microsoft.com contributor guides
• Post your question in the Learn support channel

[BillWagner]

This LGTM @gewarren

Let's