Dear blogger builders,
I think you should include the installation of "Microsoft.EntityFrameworkCore.InMemory" in the project. Otherwise, on a fresh VS 2019 installation, the "UseInMemoryDatabase" will be not available. So, add an extra step of the package installation before the step "Update Startup.cs." I could be via "NuGet Package Manager Console" for the sake of simplicity as follows:
Install-Package Microsoft.EntityFrameworkCore.InMemory
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It's in the instructions.
Please review again and amend, I followed the project instructions to the letter and double checked and had exactly the problem thiagofborn described ("UseInMemoryDatabase" not available) on a new VS 2019 install. As thiag suggested I ran "Install-Package Microsoft.EntityFrameworkCore.InMemory" from the package manager console which fixed it

it's badly written "preceding instructions" makes no sense, suggest rewording
I agree, it's poorly written. I missed this step as well until coming down to leave my own complaint.. Spacing the bulletin 1 line lower/ emboldening the InMemory package in the same style as the SqlServer package would help. (It's a second step, it gets glossed over when it's lumped under the first step)
Our interns also missed this step in the instructions. Please emphasize.
@wadepickett this has been fixed and is unrelated to #19859
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it's badly written "preceding instructions" makes no sense, suggest rewording