What is the best .NET type for collections where each key can have multiple values?

Question

I have one key but different values for that key. I tried HashTable but I don't think that is the right way of doing it.

I'll explain in detail what the requirement is:

I have a Key - "Asp.net" - for that I have n number of values - 61, 67, 100

So I have to store this somewhere like Dictionary or hash table.

Answer 1

A Dictionary<string, List<int>> would do the trick for your sample data.