I have a dataset that connects with three databases. How can I attach my Crystalreport viewer so all three are included?

protected void Page_Load(object sender, EventArgs e)
        {
            ReportDocument X = new ReportDocument();
            DataTable DTable = new DataTable();

            DataSet1TableAdapters.TableAdapterManager ????? = new WebApplication1.DataSet1TableAdapters.TableAdapterManager();

            DTable = ????????

            string ubicacion = Server.MapPath("crystalReport1.rpt");
            X.Load(ubicacion);
            X.SetDataSource(DTable);
            CrystalReportViewer1.ReportSource = X;
        }