What .NET 4.0 System.Collections.Concurrent collection added in functionality to .NET 3.0 SynchronizedCollection?

.NET 4.0 introduced the System.Collections.Concurrent namespace:

"The System.Collections.Concurrent namespace provides several thread-safe collection classes that should be used in place of the corresponding types in the System.Collections and System.Collections.Generic namespaces whenever multiple threads are accessing the collection concurrently"

• BlockingCollection<T> class
• ConcurrentBag<T> class
• ConcurrentQueue<T> class
• ConcurrentDictionary<TKey, TValue> class
• OrderablePartitioner<TSource> class
• Partitioner class
• IProducerConsumerCollection<T>
  c# multithreading collections concurrency thread-safety
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