Models\ManageViewModels.cs(2,29): error CS0234: The type or namespace name 'DataAnnotations' does not exist in the namespace 'System.ComponentModel' (are you missing an assembly reference?) [C:\github\musicstore\samples\MusicStore\MusicStore.csproj]
Models\ManageViewModels.cs(3,17): error CS0234: The type or namespace name 'AspNetCore' does not exist in the namespace 'Microsoft' (are you missing an assembly reference?) [C:\github\musicstore\samples\MusicStore\MusicStore.csproj]
Models\ManageViewModels.cs(4,17): error CS0234: The type or namespace name 'AspNetCore' does not exist in the namespace 'Microsoft' (are you missing an assembly reference?) [C:\github\musicstore\samples\MusicStore\MusicStore.csproj]
Models\ManageViewModels.cs(5,17): error CS0234: The type or namespace name 'AspNetCore' does not exist in the namespace 'Microsoft' (are you missing an assembly reference?) [C:\github\musicstore\samples\MusicStore\MusicStore.csproj]
Models\MusicStoreContext.cs(1,17): error CS0234: The type or namespace name 'AspNetCore' does not exist in the namespace 'Microsoft' (are you missing an assembly reference?) [C:\github\musicstore\samples\MusicStore\MusicStore.csproj]
Models\MusicStoreContext.cs(2,17): error CS0234: The type or namespace name 'EntityFrameworkCore' does not exist in the namespace 'Microsoft' (are you missing an assembly reference?) [C:\github\musicstore\samples\MusicStore\MusicStore.csproj]
Models\Order.cs(2,29): error CS0234: The type or namespace name 'DataAnnotations' does not exist in the namespace 'System.ComponentModel' (are you missing an assembly reference?) [C:\github\musicstore\samples\MusicStore\MusicStore.csproj]
Models\Order.cs(3,17): error CS0234: The type or namespace name 'AspNetCore' does not exist in the namespace 'Microsoft' (are you missing an assembly reference?) [C:\github\musicstore\samples\MusicStore\MusicStore.csproj]
Models\SampleData.cs(6,17): error CS0234: The type or namespace name 'AspNetCore' does not exist in the namespace 'Microsoft' (are you missing an assembly reference?) [C:\github\musicstore\samples\MusicStore\MusicStore.csproj]
Models\SampleData.cs(7,17): error CS0234: The type or namespace name 'AspNetCore' does not exist in the namespace 'Microsoft' (are you missing an assembly reference?) [C:\github\musicstore\samples\MusicStore\MusicStore.csproj]
Models\SampleData.cs(8,17): error CS0234: The type or namespace name 'EntityFrameworkCore' does not exist in the namespace 'Microsoft' (are you missing an assembly reference?) [C:\github\musicstore\samples\MusicStore\MusicStore.csproj]
Models\SampleData.cs(9,17): error CS0234: The type or namespace name 'Extensions' does not exist in the namespace 'Microsoft' (are you missing an assembly reference?) [C:\github\musicstore\samples\MusicStore\MusicStore.csproj]
Models\SampleData.cs(10,17): error CS0234: The type or namespace name 'Extensions' does not exist in the namespace 'Microsoft' (are you missing an assembly reference?) [C:\github\musicstore\samples\MusicStore\MusicStore.csproj]