Equivalent to HTTP status 426. HttpStatusCode.UpgradeRequired indicates that the client should switch to a different protocol such as TLS/1.0.
Syntax
HttpStatusCode UpgradeRequired
Requirements
Namespace: System.Net
Assembly: System (in System.dll)
Assembly Versions: 4.0.0.0
Assembly: System (in System.dll)
Assembly Versions: 4.0.0.0