Gnarly issue where in C# a "using" namespace reference show as OK but when compile it gets flagged as an error.

[Bob Howell 1]

Gnarly issue where in C# a "using" namespace reference show as OK but when I compile it gets flagged as an error. The error being "Type or namespace "x" does not exist in the namespace "eLogbook". Yet it does not show as an error in the C# editor and upon checking all libraries are referenced. Intellisense shows the namespace as present. I cannot get past these errors. ("eLogbook" is the name of the application.) I have been programming in C# since 2002 and I have never seen this issue.

Using VS 2019 Professional release 16.7.2 (latest as of this posting.)

Any assistance would be appreciated.

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