I know that hash table is like a mathematical set.
I can add keys for example to it of the keyboard.
dictionaryentry ,I have looked is the key-value pair, could you please clarify that for me and its relatioship with a hashtable.

a delegate also ,i know it delegates some method ...

thanks in advance

From msdn article - http://msdn.microsoft.com/en-us/library/4yh14awz%28VS.80%29.aspx

The Hashtable class and the Dictionary generic class implement the IDictionary interface. The Dictionary generic class also implements the IDictionary generic interface. Therefore, each element in these collections is a key-and-value pair.

Have a look at this article - http://blogs.msdn.com/brada/archive/2004/04/26/120438.aspx

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