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What is ObservableCollection and why use it for lists? How do you bind to nested properties and handle null paths safely? What is RelativeSource binding and when do you need it? How do you implement input validation with data binding? How do you implement grouping in a CollectionView?
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.NET MAUI › Advanced Data Binding & Collections

How do you efficiently update large observable collections?

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Answer

ObservableCollection raises a change event per item, which is costly for bulk updates. For large refreshes, replace the collection reference (and notify), use a batching/optimized ObservableRangeCollection (from the toolkit) with AddRange, or suspend notifications. Also prefer incremental loading for very large data.
// ObservableRangeCollection (MAUI Community Toolkit)
Items.AddRange(newBatch);   // one notification instead of N
Real-world example Loading 500 rows via AddRange updates the CollectionView once instead of triggering 500 layout passes.

Common follow-ups: Why is per-item notification slow? | What is incremental loading?

Collections Performance & Optimization Advanced Data Binding & Collections
All 6 Advanced Data Binding & Collections questions