How do I display data from multiple table in one crystal report?

        DataReportClass dr = new DataReportClass();
        DataView dview1 = new DataView();
        sale s = new sale();
        String qry, tname = "sale",tname1="sale1";
        //form load
        private void rpt_sale_Load(object sender, EventArgs e)
        {
            dview1.Table = dr.LoadReport1(tname,tname1).Tables["Temp"];
            s.SetDataSource(dview1);
            crystalReportViewer1.ReportSource = s;
        }
      //This code is in my .class file
       public DataSet LoadReport1(String tablename,String tbl)
       {
           qry = "Select * from " + tablename + ","+tbl+"";
           ds = db.search(qry);
//db is object of my another .class file includes connection string
           return ds;
       }

        public DataSet search(String s)
        {
            try
            {
                SqlDataAdapter da = new SqlDataAdapter(s, conn);
                DataSet ds = new DataSet();
                da.Fill(ds, "Temp");
                return ds;
            }
            catch(Exception ex)
            {
                throw ex;
            }
         }