Insert Specific Datatype value in HashTable

Question

I have a hashtable

Hashtable _hashTable = new Hashtable().

 

In this hashtable i want add only bool value .

 

_hashTable .Add(1, "false");

_hashTable .Add(2, "false");
_hashTable .Add(a, "true");
bcoz i need to assign this value in the below variable. 
bool _isindian = _hashTable[key].
is it possible to assign those _hashTable value in the _isindian variable ? 
Please advice.