Hello @Alan,
Welcome to Microsoft Q&A forum.
If you have the NuGet package installed, you may find it lists here(for example, .NET 7.0 based, C# project):
For CSO246 error, can you confirm that you have added using XXXX;
, for example:
If you added using XXXX
, but still don't work, please share us some screenshots and detailed steps to reproduce this issue and check further.
Looking forward to hearing from you.
Sincerely,
Tianyu
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