hi

i have a object to a user defined class which properly intialized from class when first form load, but after post back it loose reference and such error occured

[NullReferenceException: Object reference not set to an instance of an object.]
monthlyreport.GetReport() in c:\Time Entry System\WebTimeEntrySystem\monthlyreport.aspx.cs:10 0
monthlyreport.btn_show_report_Click(Object sender, EventArgs e) in c:\Time Entry System\WebTimeEntrySystem\monthlyreport.aspx.cs:94
System.Web.UI.WebControls.Button.OnClick(EventArgs e) +105
System.Web.UI.WebControls.Button.RaisePostBackEven t(String eventArgument) +107
System.Web.UI.WebControls.Button.System.Web.UI.IPo stBackEventHandler.RaisePostBackEvent(String eventArgument) +7
System.Web.UI.Page.RaisePostBackEvent(IPostBackEve ntHandler sourceControl, String eventArgument) +11
System.Web.UI.Page.RaisePostBackEvent(NameValueCol lection postData) +33
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +5102

My c# code is
Code: ( text )

   1.
      using System;
   2.
      using System.Data;
   3.
      using System.Configuration;
   4.
      using System.Collections;
   5.
      using System.Web;
   6.
      using System.Web.Security;
   7.
      using System.Web.UI;
   8.
      using System.Web.UI.WebControls;
   9.
      using System.Web.UI.WebControls.WebParts;
  10.
      using System.Web.UI.HtmlControls;
  11.
      using System.Data.SqlClient;
  12.
      using TimeEntrySystem;
  13.
      using TimeEntrySystem.BLL;
  14.

  15.
      public partial class dailyreport : System.Web.UI.Page
  16.
      {
  17.
          private DataTable objDataTable;
  18.
          private Reports objReport;
  19.

  20.
          protected void btn_show_report_Click(object sender, EventArgs e)
  21.
          {
  22.
              DateTime startingDate = Convert.ToDateTime(tb_daily_report_date.Text);
  23.

  24.
              #region
  25.
              btn_daily_report_show.Enabled = false;
  26.
              DailyReport(startingDate);
  27.
              btn_daily_report_show.Enabled = true;
  28.
              #endregion
  29.
          }
  30.

  31.
          public void DailyReport(DateTime startingDate)
  32.
          {
  33.
              objDataTable = objReport.ReturnDailyReport(startingDate);
  34.
              if (objDataTable == null)
  35.
              {
  36.
                  lb_daily_report_error.Text = "There is some error in record reports.";
  37.
              }
  38.
              if (objDataTable.Rows.Count == 0)
  39.
              {
  40.
                  lb_daily_report_error.Text = "No Record found.";
  41.
                  objDataTable.Clear();
  42.
                  return;
  43.
              }
  44.
          }
  45.

  46.
          public DataTable ObjDataTable
  47.
          {
  48.
              get { return objDataTable; }
  49.
          }
  50.
          protected void Page_Load(object sender, EventArgs e)
  51.
          {
  52.
              if (!IsPostBack)
  53.
              {
  54.
                  objDataTable = new DataTable("DailyReports");
  55.
                  objReport = new Reports();
  56.

  57.
                  DateTime startingDate = DateTime.Now.Date;
  58.
                  tb_daily_report_date.Text = startingDate.Date.ToShortDateString();
  59.
                  DailyReport(startingDate);
  60.
              }
  61.
              lb_report_duration1.Text = "Daily Report";
  62.
              lb_report_duration2.Text = tb_daily_report_date.Text;
  63.

  64.
              vld_range_daily_report_tb_start_date.MinimumValue = objReport.GetMinDate().ToShortDateString();
  65.
              vld_range_daily_report_tb_start_date.MaximumValue = DateTime.Now.ToShortDateString();
  66.

  67.
          }
  68.
          protected void start_img_Click(object sender, ImageClickEventArgs e)
  69.
          {
  70.
              tb_daily_report_date.Text = cld_tb_daily_report_date.SelectedDate.Value.ToStri ng();
  71.
          }
  72.
      }



after post objReport and objTable loose its reference from their classes

so please any body help me about that problem thanks

sorry i paste code of dailyreport.aspx and error show monthlyreport.aspx but both pages have same problem