Usage of memorycache

### Type of issue

Typo

### Description

in using of memory cache i want to out list of my Dto i fill one item of this Dto so the count of list should be one but that list is null why?

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### Page URL

https://learn.microsoft.com/en-us/dotnet/api/system.object?view=net-9.0&viewFallbackFrom=net-9.0-pp

### Content source URL

https://github.com/dotnet/dotnet-api-docs/blob/main/xml/System/Object.xml

### Document Version Independent Id

33ab6e94-fc93-40f0-6710-a057935f2d02

### Article author

@dotnet-bot