linq queery for hash table in C#

Hi 

i am useing linq query for  geting the records for hash table but it is giving error as below

could not find an implementation of the query pattern for source type hashtable

below the my  code

Hashtable h1 = new Hashtable();
Program p1 = new Program();
p1.id = 1;
p1.name = "Ram";
p1.address = "GOA";
Program p2 = new Program();
p2.id = 2;
p2.name = "LAXMAN";
p2.address = "America";

Program p3 = new Program();
p3.id = 4;
p3.name = "Kris";
p3.address = "IND";

h1.Add(1, p1);
h1.Add(2, p2);
h1.Add(3, p3);

var item = from k in h1 where k.id > 1 select k.name;

please help me