C# Chaining with Partial Repository Class

I have classes in my program like

class QueryUtil1{
 getByID(int id){
   //open connection
   //create query
  // map to dataset and return
 }
}
class QueryUtil2{
 getByID(int id){
   //open connection
   //create query
  // map to dataset and return
 }
}

so these methods calls from multiple classes creates multiple round trips to database like hundreds in some cases what I am trying to do is merge all those queries and return it in single dataset bu method chaining like

QueryUtil utill = new QueryUtil()l
Dataset ds = utill
._queryUtil1.getByID(id)
._queryUtil2.getByID(id)
.execute();

whose implementation is

class QueryUtil {
 StringBuilder query = new StringBuilder();
 QueryUtil1 _queryUtil1 = new QueryUtil1();
 QueryUtil2 _queryUtil2 = new QueryUtil2();

 execute(){
  string sql = query.ToString();
  //execute command and return dataset
 }
class QueryUtil1 : QueryUtil{
     QueryUtil getByID(int id){
       query.append("select * from table where id = " + id);
       return this;
     }
    }
}

but the problem is it throws stackoverflowexeption because child class initiates parent class and parent class initiate child class and so on... I want to achieve chaining any idea how to?