晶体报告已达到最大报告处理

Question

    using System;
    using System.Collections.Generic;
    using System.Web;
    using System.Web.UI;
    using System.Web.UI.WebControls;
    using System.Configuration;
    using System.Data;
    using System.Data.SqlClient;
    using System.Web.Security;
    using System.Web.UI.HtmlControls;
    using System.Web.UI.WebControls.WebParts;
    using System.Drawing.Imaging;
    using System.Drawing;
    using System.Drawing.Drawing2D;
    using System.IO;
    using System.Xml;
    using CrystalDecisions.CrystalReports.Engine;

    using CrystalDecisions.ReportSource;
    using CrystalDecisions.Reporting;
    using CrystalDecisions.Shared;
    using CrystalDecisions.Web;


        public partial class Schools : System.Web.UI.Page
        {
            ReportDocument crystalReport = new ReportDocument();

            protected void Page_Init(object sender, EventArgs e)
            {
                if (!Page.IsPostBack)
                {
                    try
                    {

                        string query = "select * from School Where Designation = 'Public' Order by School ASC";

                        crystalReport.Load(Server.MapPath("ReportPrimary.rpt"));


                        MPrimary dsCustomers = GetData(query);
                        crystalReport.SetDataSource(dsCustomers);

                        crystalReport.SetDatabaseLogon("username", "password.34", "mssql.webaddress.net,4118", "dataDB");

                        SchReport.ReportSource = crystalReport;

                        Session["ReportDocument"] = crystalReport;
                    }
                    catch (LogOnException ex)
                    {
        //Throws an exception if an error is encountered on retrieval
                    }


                }
                else
                {


                     string query = "select * from School Where Designation = " + "'" + drpSchoolDesignation.SelectedValue + "'" + " Order by School ASC";

                    //    ReportDocument crystalReport = new ReportDocument();
                    crystalReport.Load(Server.MapPath("ReportPrimary.rpt"));


                    TextObject to = (TextObject)crystalReport.ReportDefinition.Sections["Section2"].ReportObjects["Text3"];
                    to.Text = drpSchoolDesignation.SelectedValue.ToUpper() + " SCHOOLS";

                    MPrimary dsCustomers = GetData(query);
                    crystalReport.SetDataSource(dsCustomers);
                    SchReport.FindControl("Text3");

                    crystalReport.SetDatabaseLogon("username", "password.34", "mssql.webaddress.net,4118", "dataDB");


                    ReportDocument doc = (ReportDocument)Session["ReportDocument"];
                    SchReport.ReportSource = doc;

                }

            }
            protected void Page_Load(object sender, EventArgs e)
            {

            }
            private void OpenNewWindow(string url, string windowName, string windowParams)
            {
                if (url == null)
                    throw new ArgumentNullException("url");
                if (windowName == null)
                    windowName = "";
                if (windowParams == null)
                    windowParams = "";
                string scriptCode =
                    string.Format(
                        "<script>window.open('{0}','{1}','{2}');</script>",
                        url, windowName, windowParams);
                //write the script out to HTTP Response stream
                Response.Write(scriptCode);
            }
            private MPrimary GetData(string query)
            {
                string conString = ConfigurationManager.ConnectionStrings["DBConnectionString1"].ConnectionString;
                SqlCommand cmd = new SqlCommand(query);
                using (SqlConnection con = new SqlConnection(conString))
                {
                    using (SqlDataAdapter sda = new SqlDataAdapter())
                    {
                        cmd.Connection = con;

                        sda.SelectCommand = cmd;
                        using (MPrimary dsCustomers = new MPrimary())
                        {
                            sda.Fill(dsCustomers, "School");
                            return dsCustomers;
                        }
                    }
                }
            }
            protected void drpSchoolDesignation_SelectedIndexChanged(object sender, EventArgs e)
            {

                drpDisplay.SelectedIndex = 0;
                drpSort.SelectedIndex = 0;


                string   query = "select * from School Where Designation = " + "'" + drpSchoolDesignation.SelectedValue + "'" + " Order by School ASC";


                crystalReport.Load(Server.MapPath("ReportPrimary.rpt"));

                TextObject to = (TextObject)crystalReport.ReportDefinition.Sections["Section2"].ReportObjects["Text3"];
                to.Text = drpSchoolDesignation.SelectedValue.ToUpper() + " SCHOOLS";

                MPrimary dsCustomers = GetData(query);
                crystalReport.SetDataSource(dsCustomers);

                crystalReport.SetDatabaseLogon("username", "password.34", "mssql.webaddress.net,4118", "dataDB");

                Session["ReportDocument"] = crystalReport;
                SchReport.ReportSource = crystalReport;

            }
            protected void CrystalReportViewer1_Unload(object sender, EventArgs e)
            {
                crystalReport.Close();
                crystalReport.Dispose();
            }

            protected void Button1_Click(object sender, EventArgs e)
            {
        //Select data from DB
            //Action to be added later
            }


        }

此代码应该使用水晶报告检索和显示信息。     看来我的对象没有得到妥善处理。修改此代码会禁止用户访问文档的第3页。任何帮助，将不胜感激。提前谢谢你们。