Dictionaries
§Dictionaries (Type DbDictionary)
§Containers to hold data only
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§Holds other Dictionaries
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§Holds non-graphical Objects (derived from DbObject but not DbEntity!)
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§Is enumerable
Each item has a string key
Items searchable with a string key using GetAt() or Item
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In the AutoCAD drawing database there are dictionaries. A dictionary is a type of container that only contains data or other dictionaries that contain the data. These are non-graphical objects that are derived from dbObject, Dictionaries  do not contain objects that are derived from DbEntity. Each item in a dictionary will have a key that will allow you to find out if a particular item already exists in that dictionary.  You use the GetAt method or item property for this.