Resolving this requirement using "Session" and "page_init" as suggested. Please note, my application need to collect many inputs from the end user before generating the report & many of the text inputs have Autopostback set as true. Everytime the autopostback happens, Crystal Report refreshes, hence I recommend using as less possible Autopostback enabled input fields with your web form.
Sample ASP page
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="c4.aspx.cs" Inherits="CrystalTest.c4" %>
<%@ Register Assembly="CrystalDecisions.Web, Version=13.0.4000.0, Culture=neutral, PublicKeyToken=692fbea5521e1304" Namespace="CrystalDecisions.Web" TagPrefix="CR" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Button ID="Button1" runat="server" Text="Print Report" OnClick="Button1_Click" />
<CR:CrystalReportViewer ID="CrystalReportViewer1" runat="server" AutoDataBind="true" />
</div>
</form>
</body>
</html>
and the code behind (copied from a crude test form, please make sure that you follow the coding standards recommended). Please note, this sample doesn't have "page_load" method, hence if you have specific situations where page_load is required, you will have to adapt much tedious approaches or clicking the button to generate the report should be redirected to a page where you have only the report.
using CrystalDecisions.CrystalReports.Engine;
using System;
using System.Collections.Generic;
using System.Configuration;
using System.Data;
using System.Data.SqlClient;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace CrystalTest
{
public partial class c4 : System.Web.UI.Page
{
protected void Page_Init(object sender, EventArgs e)
{
if (IsPostBack)
{
CrystalReportViewer1.ReportSource = (ReportDocument)Session["Report"];
}
}
private void ShowReport1()
{
string ConnectionString = ConfigurationManager.ConnectionStrings["menass"].ToString();
using (SqlConnection con = new SqlConnection(ConnectionString))
{
using (SqlCommand cmd = new SqlCommand("GETMONTHSALARY", con))
{
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.Add("@pProcessYear", SqlDbType.Int).Value = 2020;
cmd.Parameters.Add("@pProcessMonth", SqlDbType.Int).Value = 1;
cmd.Parameters.Add("@pProcessSection", SqlDbType.VarChar).Value = "9";
cmd.Parameters.Add("@pProcessSite", SqlDbType.VarChar).Value = "1";
cmd.Parameters.Add("@pProcessCatg", SqlDbType.VarChar).Value = "1";
SqlDataAdapter adapter = new SqlDataAdapter(cmd);
DataSet ds = new DataSet();
adapter.Fill(ds, "SalaryDT");
ReportDocument oRpt = new ReportDocument();
oRpt.Load(Server.MapPath(@"~/dataset/CrystalReport1.rpt"));
oRpt.DataSourceConnections.Clear();
oRpt.SetDataSource(ds);
oRpt.Subreports[0].SetDataSource(FillOverTime());
CrystalReportViewer1.Visible = true;
CrystalReportViewer1.ReportSource = oRpt;
Session["Report"] = oRpt;
}
}
}
private DataSet FillOverTime()
{
string ConnectionString = ConfigurationManager.ConnectionStrings["menass"].ToString();
using (SqlConnection con = new SqlConnection(ConnectionString))
{
using (SqlCommand cmd = new SqlCommand("GetEmployeeOverTime", con))
{
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.Add("@pEmployeeCode", SqlDbType.VarChar).Value = DBNull.Value;
cmd.Parameters.Add("@pProcessYear", SqlDbType.Int).Value = 2020;
cmd.Parameters.Add("@pProcessMonth", SqlDbType.Int).Value = 1;
SqlDataAdapter adapter = new SqlDataAdapter(cmd);
DataSet ds1 = new DataSet();
adapter.Fill(ds1, "OverTimeDT");
return ds1;
}
}
}
protected void Button1_Click(object sender, EventArgs e)
{
ShowReport1();
}
}
}
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