Difference in HybridDictionary and Generic Dictionary Item behavior if the specified key is not found

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In .Net 1.1 I've used HybridDictionary.Item and my code expected that if the specified key is not found, attempting to get it returns a null reference.
But in .Net 2.0  Generic Dictionary.Item  if the specified key is not found, a get operation throws a KeyNotFoundException  and I have to use Dictionary.TryGetValue  or check ContainsKey before calling Item.