Hashtable with multiple values for single key

Question

I want to store multiple values in single key like:

HashTable obj = new HashTable();
obj.Add(\"1\", \"test\");
obj.Add(\"1\", \"Test1\");

Right

Answer 1

Store a list in the hashtable:

obj.Add("1",new List());
(obj["1"] as List).Add("test");
(obj["1"] as List).Add("test1");

This is a common trick.