[Enter feedback here]
Also is caused by:

    public static ObservableCollection<CeisData> BuildCeis()
    {
         <<< code>>>
    }

where CeisData is lower scope than function. Such as CeisData being internal scope rather than public scope.

Document Details

⚠ Do not edit this section. It is required for docs.microsoft.com ➟ GitHub issue linking.

• ID: 372ec1ff-3714-0004-47bd-d078c3f4cc90
• Version Independent ID: 4779ac2d-7fdb-5d20-564f-0f6b6614d4e7
• Content: Compiler Error CS0050
• Content Source: docs/csharp/language-reference/compiler-messages/cs0050.md
• Product: dotnet-csharp
• Technology: csharp-diagnostics
• GitHub Login: @BillWagner
• Microsoft Alias: wiwagn

Associated WorkItem - 477084