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There are many collection classes and generic collection classes. &nbsp;When do I use IDictionary versus hashtable which also takes a key?<br />
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Any &quot;tomes&quot; on this work - when to use what collection? 
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There are many collection classes and generic collection classes.  When do I use IDictionary versus hashtable which also takes a key?

Any "tomes" on this work - when to use what collection? 

When and why to use IDictionary

C# is an object-oriented programming language created in conjunction with Microsoft’s .NET framework. Compilation is usually done into the Microsoft Intermediate Language (MSIL), which is then JIT-compiled to native code (and cached) during execution in the Common Language Runtime (CLR).