i am trying to execute following code in asp

var strSQL1="select Model from Phones where Brand='"+ brand +"'";
var strSQL2="select Model from Phones where Model='"+ model +"'";
var strSQL3="select Model from Phones where Camera='"+ camera +"'";

var strSQL=strSQL1+ " intersect "+ strSQL2+" intersect "+strSQL3
conn.Execute(st rSQL);...