private void Show()
        {
            DataSet ds=new DataSet();
            string connStr = "server=.;database=demo;uid=sa;pwd=12345";
            using (SqlConnection conn=new SqlConnection(connStr))
            {
                conn.Open();
                string sql1 = "select * from Dept";
                string sql2 = "select * from UserInfo";
                SqlDataAdapter da = new SqlDataAdapter(sql1, conn);
                da.Fill(ds, "Dept");
                da = new SqlDataAdapter(sql2, conn);
                da.Fill(ds, "UserInfo");
            }
            ReportDocument rd = new ReportDocument();
            rd.Load(Server.MapPath("~/Report/CrystalReport1.rpt"));
            rd.SetDataSource(ds);
            CrystalReportViewer1.ReportSource = rd;

        }