SqlConnection conn = new SqlConnection("server=.;uid=sa;pwd=chen123;database=C_News;");
            conn.Open();
            SqlCommand cmd = new SqlCommand("",conn);
            //cmd.CommandText = "select * from C_Article a left join C_BigClass b on a.BigClass=b.BigClass";
            cmd.CommandText = "select * from C_Article";
            SqlDataAdapter da = new SqlDataAdapter();
            da.SelectCommand = cmd;
            DataSet ds = new DataSet();
            da.Fill(ds,"DataSet1");
            ds.Tables[0].TableName = "C_Article";

            cmd.CommandText = "select * from C_BigClass";
            SqlDataAdapter da2 = new SqlDataAdapter();
            da.SelectCommand = cmd;
            da.Fill(ds,"DataSet1");
            ds.Tables[1].TableName = "C_BigClass";
            //ds.Tables[0].TableName = "DataSet1";

            CrystalReport1 oCR = new CrystalReport1();
            oCR.SetDataSource(ds);
            this.CrystalReportViewer1.ReportSource = oCR;
            this.CrystalReportViewer1.DataBind();

            conn.Close();