Ask the publishers to restore access to 500,000+ books.
Search the history of more than 1 trillion web pages.
Capture a web page as it appears now for use as a trusted citation in the future.
Please enter a valid web address
Loading...
https://learn.microsoft.com/dotnet/csharp/language-reference/keywords/extension | 23:02:34 November 23, 2025
Got an HTTP 302 response at crawl time
Redirecting to...
/en-us/dotnet/csharp/language-reference/keywords/extension
Impatient?
Get our FREE eBook "10 Programming Tips That Changed Everything" when you subscribe!
No spam. Unsubscribe anytime.
Live Music
Archive
Librivox
Free Audio
Metropolitan Museum
Cleveland
Museum of Art
Internet
Arcade
Console Living Room
Open Library
American
Libraries
TV News
Understanding
9/11