Session Time out Problem in Asp.net......Please help

Hello FRIENDS,

Have a good day all of you.

Facing trouble with session timeout.
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I have created a web application in Asp.net c#, Sql Server 2005.

but am facing a problem with session timeout.

my first page is login.aspx, this page is used to access/open the application.

after user login, if his/her username and password is correct. it will redirect to the main pages, here he will see/access all the webpages.

Suppose, if i stay idle for some time on this application....it shows an error.

THIS IS THE ERROR...

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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 18: lblDate.Text = System.DateTime.Now.ToLongDateString();
Line 19: lblTime.Text = System.DateTime.Now.ToShortTimeString();
Line 20: lblWelcomeMSG.Text = Session["UserName"].ToString();
Line 21: }
Line 22: }

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Please help me and SUGGEST me, how to solve me this problem.

Thanks in Advance.

Tags: C#, ASP.NET, SQL Server, Session