Thread safe collections in .NET

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The .NET 4.0 Framework introduces several thread-safe collections in the System.Collections.Concurrent Namespace:

ConcurrentBag<T>
      Represents a thread-safe, unordered collection of objects.

ConcurrentDictionary<TKey, TValue>
    Represents a thread-safe collection of key-value pairs that can be accessed by multiple threads concurrently.

ConcurrentQueue<T>
    Represents a thread-safe first in-first out (FIFO) collection.

ConcurrentStack<T>
    Represents a thread-safe last in-first out (LIFO) collection.

Other collections in the .NET Framework are not thread-safe by default and need to be locked for each operation:

lock (mySet)
{
    mySet.Add("Hello World");
}

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