Session timeout exception

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If for 20 minutes the website is idle and later if a navigation button is clicked
an exception is thrown for the user stating that 'Object reference not set to an instance of an object'. How to avoid this?
Thanks.

Posted 4-May-14 23:50pm

S.Rajendran from Coimbatore

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DamithSL 5-May-14 6:22am

update the question with how you check the session values

3 solutions

Solution 1

The Default Timeout Is 20 minutes

http://msdn.microsoft.com/en-us/library/system.web.sessionstate.httpsessionstate.timeout%28v=vs.110%29.aspx[^]

Posted 4-May-14 23:52pm

King Fisher

Solution 2

Your code have to check that if timeout, redirect the user to some default page, check this out:
redirect-to-login-page-after-session-timeout[^]

Posted 4-May-14 23:57pm

Peter Leow

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DamithSL · Accepted Answer · 2014-05-05T00:28:00

As a best practice you should check session exist first

C#

if(Session["myVal"] != null)  
{  
     string myVal = Session["myVal"].ToString();
}
else
{
     Response.Redirect("Login.aspx")
}

if you directly call Session["myVal"].ToString(), you will get "'Object reference not set to an instance of an object'." in case of session value null.

you may need to do this on each and every page. but there is a easy way by using global aspx file
Check these answers[^]
if you need to increase session timeout, then check these answers[^]