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up vote 0 down vote favorite

abc.aspx is my page and in my site menu navigation I have categories like "apple", banana" etc. While clicking the categories in the menu I'm appending the categories as query string in the URL like below

http://www.example.com/abc/abc.aspx?filter=apple

Page works fine when user clicks the menu and loads this page. However, if we load this URL separately in new tab/new window it throws "Object reference not set to instance" error. This issue is not reproduced in local. 

string filter = Request.QueryString["filter"]; 
Data[] dt_Data = Search.GetResults(filter);

This code just pass the query string value to GetResults method and returns array of Data objects which i bind to the page. Please note that the code is working fine while navigating via Menu. If the page is loaded in a new tab/new window then only I'm getting error. So here code implementation doesn't seem to have any issue.

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3  
Please show some code. – Leopard Jun 15 at 7:27
    
What is Search – Bob Vale Jun 15 at 8:05
up vote 0 down vote accepted

The problem is, I have logs in which the UrlReferrer is captured something like below

Uri myReferrer = Request.UrlReferrer;
UrlRefer = myReferrer.ToString();

When I click the Category from Menu then URL refer is www.example.com. But when I load the page in a seperate window/tab this UrlReferrer becomes null which is thrown as error.

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