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System.Collections.Specialized contains StringDictionary http://msdn.microsoft.com/en-us/library/system.collections.specialized.stringdictionary.aspx#Y1626
What's difference with Strong Typed Dictionary in Generics?
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A dictionary, also called an associative array, is a collection of unique keys and a collection of values, where each key is associated with one value. Retrieving and adding values is very fast. Dictionaries take more memory because for each value there is also a key.
In C#, Dictionary is a generic collection which is generally used to store key/value pairs. The working of Dictionary is quite similar to the non-generic hashtable. The advantage of Dictionary is, it is generic type. Dictionary is defined under System. Collection.
StringDictionary comes from .Net 1, which predates generics.
Therefore, unlike Dictionary<String, String>, it doesn't implement any generic interfaces, so it cannot be used with LINQ (unless you Cast())
Also, StringDictionary normalizes all keys to lowercase.
(To make a case-insensitive Dictionary<String, String>, pass StringComparer.OrdinalIgnoreCase; this is also more compatible with Turkey)
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