Update get-started-counter-csharp-mvux.md

[JohannesMP]

• The MainModel section walks you through the creation of MainModel.cs which defines the partial record MainModel.
• However the DataBinding section only refers to MainViewModel which is never defined.

This PR renames MainViewModel references in the DataBinding section to be MainModel, as the examples would not compile otherwise.

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Alternatively if the intent was to use MainViewModel then the MainModel section should be updated accordingly instead.

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[Kunal22shah]

@JohannesMP these renames aren't necessary. The the MainViewModel that is used for dataContext is auto generated using the new MVUX v3 generator see here : Upgrading Extensions Reactive Version
and : https://platform.uno/docs/articles/external/workshops/simple-calc/modules/MVUX-CSharp/04-App%20Architecture/README.html#binding-to-properties-in-the-ui

Which is different from the MainModel, this is the default now, so all new Uno Apps should have this
[assembly: Uno.Extensions.Reactive.Config.BindableGenerationTool(3)] in GlobalUsings
and the app would compile.

if it's not compiling on your side then maybe you aren't on the later sdk versions where this was added. Let me know if I can help you with more info on the same : )

[JohannesMP]

@JohannesMP these renames aren't necessary. The the MainViewModel that is used for dataContext is auto generated using the new MVUX v3 generator see here : Upgrading Extensions Reactive Version and : https://platform.uno/docs/articles/external/workshops/simple-calc/modules/MVUX-CSharp/04-App%20Architecture/README.html#binding-to-properties-in-the-ui

Which is different from the MainModel, this is the default now, so all new Uno Apps should have this [assembly: Uno.Extensions.Reactive.Config.BindableGenerationTool(3)] in GlobalUsings and the app would compile.

if it's not compiling on your side then maybe you aren't on the later sdk versions where this was added. Let me know if I can help you with more info on the same : )

Thank you for clarifying!

In that case I would recommend that the sample/tutorial app docs should mention this.

Right now it just says "Now that we have the MainViewModel class ..." after creating MainModel.

[jeromelaban]

Indeed, the name of the class in DataBinding is incorrect, it was fixed here: #18708