Cannot add own custom EFDataAcces Library Visual studio 2019

Question

In a web project i would like to add custom library I right click on dependencies => add reference It shows my custom library which i did for ef core. But when i click ok button it just does nothing. pretending like nothing happened.

csproj file contents

<Project Sdk="Microsoft.NET.Sdk">
<PropertyGroup>
<TargetFramework>net5.0</TargetFramework>
</PropertyGroup>
<ItemGroup>           
<PackageReference Include="Microsoft.EntityFrameworkCore" Version="5.0.12"/> </ItemGroup> 
</Project>

Answer 1

It is fixed after updating nuget packages. Update Swashbuckle and Azure container tools.