Server Error in '/' Application

The error occurs on one of the forms, I can edit the form and click the update button when I first go to the page and everything works fine, but if I visit the page and wait for about 2 -5 minutes and then try editing the form and clicking the update button I ge this error;

It looks to be something wrong with the session ID and I thought it could be something to do with timeout issues but im not sure.

Any suggestions will be appreciated:

Server Error in '/' Application. Object reference not set to an instance of an object. Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.

Source Error:

Line 80: protected void imgUpdateDetails_Click(object sender, EventArgs e)

Line 81: {

Line 82: SessionManager.CurrentBusinessClubMember.BCMListingDetails.BusinessClubMemberID = SessionManager.CurrentBusinessClubMember.ID;

Line 83: SessionManager.CurrentBusinessClubMember.BCMListingDetails.Address1 = editaddressline1.Value;

Line 84: SessionManager.CurrentBusinessClubMember.BCMListingDetails.Address2 = editaddressline2.Value;

Source File: d:Sitesdemelzabusinessclub.co.ukpublic_htmlWebsiteListingDetails.aspx.cs Line: 82

Stack Trace:

[NullReferenceException: Object reference not set to an instance of an object.] DemelzaBusinessClubSite_ListingDetails.imgUpdateDetails_Click(Object sender, EventArgs e) in d:Sitesdemelzabusin/essclub.co.ukpublic_htmlWebsiteListingDetails.aspx.cs:82

System.Web.UI.WebControls.LinkButton.OnClick(EventArgs e) +111

System.Web.UI.WebControls.LinkButton.RaisePostBackEvent(String eventArgument) +79

System.Web.UI.WebControls.LinkButton.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +10

System.开发者_StackOverflow中文版Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +13

System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +175

System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1565

Version Information: Microsoft .NET

Framework Version:2.0.50727.5444;

ASP.NET Version:2.0.50727.5420

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in your method

imgUpdateDetails_Click

you have a line that states

SessionManager.CurrentBusinessClubMember.BCMListingDetails.Address2 = editaddressline2.Value;

The error indicates that one of the following hasn't been instantiated before being used.

SessionManager
SessionManager.CurrentBusinessClubMember
SessionManager.CurrentBusinessClubMember.BCMListingDetails
editaddressline2

unless you are storing these objects somewhere like in the session and pulling them out on each post back they will be null!

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It looks like gDetails is null from your stack trace, and/or SessionManager or SessionManager.CurrentBusinessClubMember.

The / Application just means your application is running in the root directory of your server.

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Something on line 82 is null, i.e. it hasn't been set to a value. Try placing a breakpoint on line 82 and debugging the application. Then inspect each object to see what is null.