Piotr Wosiek

Works for me. What kind of framework you use? .NET Core requires additional encoding, see [this SO question](https://stackoverflow.com/questions/50858209/system-notsupportedexception-no-data-is-available-for-encoding-1252).

Thanks for pointing me in the right direction. I've added a new test method since `EnsureDefaultServices()` uses `AddIdentity()` which inside calls `AddAuthentication()` which in turn actually registers `TimeProvider` ([see here](https://github.com/dotnet/aspnetcore/blob/c52a7abf3a8a08213dea461c7d97f421b9d862e6/src/Security/Authentication/Core/src/AuthenticationServiceCollectionExtensions.cs#L26))....

/azp run

@martincostello Anything more I should do?

Sure. I made `TimeProvider` optional in both versions of `PostConfigureSecurityStampValidatorOptions`. I've also removed the assert for `TimeProvider` from test case.

Bumping this issue. Even Visual Studio SQL Server Object Explorer supports pasting whole tables.