ServerError:Object reference not set to an instance of an object.

[swathi amireddy]

Hi,

Im working on migration of one proj from .Net1.1 to2.0 in that some pages are unble to run;

on Debug i havent obeserved ani error at any line but in IE .getting this error

ServerError:Object reference not set to an instance of an object.

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
 
/// <summary>
/// Summary description for DCA_Reassign.
/// </summary>
public partial class Presentation_DCAdmin_DCA_Reassign : System.Web.UI.Page
{
 
    protected void Page_Load(object sender, EventArgs e)
    {
        Response.Cache.SetCacheability(HttpCacheability.NoCache);
        CommonUI.CheckUser();
        CommonUI.FillHeader(litHeader, "Diagnostic Center Admin");
        btnView.Attributes.Add("onclick", "return validate();");
        Session["pid"] = "1";
        if (!IsPostBack)
        {
            Session["pid"] = "1";
            DC_Admin objDCAdmin = new DC_Admin(Session["UserId"].ToString());
            objDCAdmin.InsertUsageCount("P", Convert.ToInt32(Session["pid"].ToString()));
            tblNoData.Visible = false;
            tblDetails.Visible = false;
            FillCountryList();
            Response.Write("I am wrkin");
          //  ddlLocation.Items.Insert(0, new ListItem("--Select--", "0"));
          //  ddlDiagnosticCenter.Items.Insert(0, new ListItem("--Select--", "0"));
        }
        // Put user code to initialize the page here
 
    }
 
    private void FillCountryList()
    {
        try
        {
            DC_Admin objDCAdmin = new DC_Admin(Session["UserId"].ToString());
            DataSet dsDetails = objDCAdmin.DC_GetCountryNames();
            CommonUI.FillDropdown(ddlCountry, dsDetails.Tables[0], "COUNTRY_NAME", "COUNTRY_CODE", "--Select--", "--Select--");
            objDCAdmin = null;
        }
        catch
        {
        }
    }
 
    #region Web Form Designer generated code
    override protected void OnInit(EventArgs e)
    {
        //
        // CODEGEN: This call is required by the ASP.NET Web Form Designer.
        //
        if (Session["UserID"] == null)
        {
            Session["UserID"] = "0";
        }
        InitializeComponent();
        base.OnInit(e);
        CommonUI.LoadDefaults(BodyID, litHeader, Session["UserID"].ToString());
    }
 
    /// <summary>
    /// Required method for Designer support - do not modify
    /// the contents of this method with the code editor.
    /// </summary>
    private void InitializeComponent()
    {
        this.grdDetails.ItemCommand += new System.Web.UI.WebControls.DataGridCommandEventHandler(this.grdDetails_ItemCommand);
 
    }
    #endregion
 
 
    protected void ddlCountry_SelectedIndexChanged(object sender, EventArgs e)
    {
        string CountryCode = Convert.ToString(ddlCountry.SelectedValue);
        try
        {
            DC_Admin objDCAdmin = new DC_Admin(Session["UserId"].ToString());
            DataSet dsDetails = objDCAdmin.DC_GetCityNames(CountryCode);
            CommonUI.FillDropdown(ddlLocation, dsDetails.Tables[0], "CCM_CITY_DESC", "CCM_NEW_CTY_CODE", "--Select--", "--Select--");
        }
        catch
        { }
        ddlDiagnosticCenter.Items.Clear();
        ddlDiagnosticCenter.Items.Insert(0, new ListItem("--Select--", "-1"));
        ddlDiagnosticCenter.ClearSelection();
        ddlDiagnosticCenter.Items[0].Selected = true;
    }
    protected void ddlLocation_SelectedIndexChanged(object sender, EventArgs e)
    {
        string CityCode = Convert.ToString(ddlLocation.SelectedValue);
        try
        {
            DC_Admin objDCAdmin = new DC_Admin(Session["UserId"].ToString());
            DataSet dsDetails = objDCAdmin.DC_GetDCName(CityCode);
            CommonUI.FillDropdown(ddlDiagnosticCenter, dsDetails.Tables[0], "DC_VENDOR_NAME", "DC_VENDOR_ID", "--Select--", "--Select--");
        }
        catch
        { }
        ddlDiagnosticCenter.ClearSelection();
        ddlDiagnosticCenter.Items[0].Selected = true;
    }
    protected void btnView_Click(object sender, EventArgs e)
    {
        CommonUI.CheckUser();
        int CandidateId = -1;
        if (txtCandId.Text.Trim() != "")
            CandidateId = Convert.ToInt32(txtCandId.Text);
        string CandidateName = "-1";
        if (txtCandName.Text.Trim() != "")
            CandidateName = txtCandName.Text.Trim();
        string Country = Convert.ToString(ddlCountry.SelectedValue.Trim().ToString());
        string Location = Convert.ToString(ddlLocation.SelectedValue.Trim().ToString());
        string DCId = ddlDiagnosticCenter.SelectedValue.Trim().ToString();
 
        try
        {
            DC_Admin objDCAdmin = new DC_Admin(Session["UserId"].ToString());
            DataSet dsDetails = objDCAdmin.DC_Getcandidate_Deatails(CandidateId, CandidateName, Country, Location, DCId, 2);
            if (dsDetails.Tables[0].Rows.Count > 0)
            {
                tblNoData.Visible = false;
                tblDetails.Visible = true;
                grdDetails.DataSource = dsDetails;
                grdDetails.DataBind();
            }
            else
            {
                tblNoData.Visible = true;
                tblDetails.Visible = false;
            }
        }
        catch
        { }
 
    }
 
    protected void grdDetails_ItemCommand(object source, DataGridCommandEventArgs e)
    {
        if (e.CommandName.ToString() == "Reassign")
        {
            int CandidateId = Convert.ToInt32(e.Item.Cells[0].Text.ToString());
            Response.Redirect("ReassignCandidate.aspx?CandidateId=" + CandidateId);
        }
    }
}

pls suggest a solution for this

thanks&regards

Swathi

[kenobewan]

Please do something first with your catch blocks and report back. Thanks.

[r035198x]

The error message should also have contained the exact line number where that exception was thrown.