want to store Hashtable within a hashtable.Requirment is want to keep classid in one hashtable and coresponding student rec in another hashtable.

hashtable1
key clsid=1
hashtable2
[Data] sname="xxx",stu_id="2" ect

hashtable1
key clsid=2
hashtable2
[Data] sname="yyy",stu_id="4" ect

i tried below but doen't work.Pl advice me how to store and retrive from Hash table

    for(int k=0;k<=3;k++)
                                {
                                      if (!m_htMetadata.ContainsKey("clsid"))
                                      {
                                          m_htMetadata.Add("clsid", k.ToString ());
                                      }


                                      htAsset = (Hashtable)m_htMetadata["Data"];

                                      htAsset.Add ("sname","xxx");
                                      htAsset.Add ("stu_id","22");



                                  }