https://brightcoding.teachable.com/courses/asp-net-core-razor-pages-the-complete-guide-net-6/lectures/42901745
42 : Managing More Complex Validation with ModelState | Bright Coding
ASP.NET Core Razor Pages The Complete Guide (.NET 6)
managingcomplexvalidationbrightcoding
https://aws.github.io/amazon-chime-sdk-android/amazon-chime-sdk/com.amazonaws.services.chime.sdk.meetings.audiovideo.video.backgroundfilter/-segmentation-processor/model-state.html
modelState