Update csharp-sdk.md

[JayGhb]

Updated C# code example based on latest SDK version.

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[ttorble]

@laujan

Can you review the proposed changes?

Important: When the changes are ready for publication, adding a #sign-off comment is the best way to signal that the PR is ready for the review team to merge.

#label:"aq-pr-triaged"
@MicrosoftDocs/public-repo-pr-review-team

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[JayGhb]

Just following up on this!

[ttorble]

@laujan - can you review this PR please?

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