Object reference not set to an instance of an object error.

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We have a web applications that most of users have no problem with it. But so far only few customers called when they went to the page, they got 'Object reference not set to an instance of an object', I cannot reproduce this on my computer.The error occurs only in ie8.The application was done in asp.net4.0

C#

protected void Page_Load(object sender, EventArgs e) {
            if (!IsPostBack) {
                FillStores();
                if (Session["DealType"] != null && Request.UrlReferrer.LocalPath == "/DealOptions.aspx")
                {
                    ddlCategory.SelectedIndex=ddlCategory.Items.IndexOf(ddlCategory.Items.FindByText(Session["DealType"].ToString().Replace("and", "&")));
                    DisplayLinkButton();
                }
                //else  if (Session["store"] != null)//code for back button from onlinedeal_n.aspx
                //    {
                //        ddlCategory.SelectedValue = Session["store"].ToString();
                //        DisplayLinkButton();
                //    }
                else  if (Session["ssnCategory"] != null && Request.UrlReferrer.LocalPath=="/onlinedeals4.aspx")//code for back from onlinedeal4.aspx
                    {
                        ddlCategory.SelectedValue = Session["ssnCategory"].ToString();
                        DisplayLinkButton();
                    }
                if (Session["DealType"] == null)
                {

                    FillStores();
                }
                if (Session["ssnCategory"] == null)
                {

                    FillStores();

                }

                }
            }

Posted 24-May-12 21:40pm

Tirthankar Dutta

Updated 25-May-12 10:51am

Wendelius

v3

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Comments

Prasad_Kulkarni 25-May-12 3:44am

You need to provide some code snippet of what you have tried. How could one answer by just knowing this error.

Tirthankar Dutta 25-May-12 3:48am

protected void Page_Load(object sender, EventArgs e) {
if (!IsPostBack) {
FillStores();
if (Session["DealType"] != null && Request.UrlReferrer.LocalPath == "/DealOptions.aspx")
{
ddlCategory.SelectedIndex=ddlCategory.Items.IndexOf(ddlCategory.Items.FindByText(Session["DealType"].ToString().Replace("and", "&")));
DisplayLinkButton();
}
//else if (Session["store"] != null)//code for back button from onlinedeal_n.aspx
// {
// ddlCategory.SelectedValue = Session["store"].ToString();
// DisplayLinkButton();
// }
else if (Session["ssnCategory"] != null && Request.UrlReferrer.LocalPath=="/onlinedeals4.aspx")//code for back from onlinedeal4.aspx
{
ddlCategory.SelectedValue = Session["ssnCategory"].ToString();
DisplayLinkButton();
}
if (Session["DealType"] == null)
{

FillStores();
}
if (Session["ssnCategory"] == null)
{

FillStores();

}

}
}

Tirthankar Dutta 25-May-12 3:52am

follow this link:http://support.microsoft.com/kb/810098

2 solutions

Solution 2

where you are using session data before using session data check the null. and second in web config file increase the time of session expire like that :-

HTML

<system.web>
<sessionstate mode="InProc" timeout="60" />
</system.web>

and third in ie8 set the compatibility setting. i think after doing all that your problem will sort out.

best of luck.

Posted 25-May-12 2:45am

Prosan

Updated 25-May-12 21:00pm

v3

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Sandeep Mewara · Accepted Answer · 2012-05-24T22:06:00

Solution 1

This error happens when you try to use a property or call a method of an object that is null. More details: here[^]

Handle all such calls/places where the error possibility is there:
1. Put null check
2. Try-catch block

Posted 24-May-12 22:06pm

Sandeep Mewara

v2

Comments

VJ Reddy 25-May-12 6:30am

Succinct, yet elaborate 5!

Sandeep Mewara 25-May-12 15:27pm

:)