SharePoint Exception: No item exists [url]. It may have been deleted or renamed by another user.

This is one of the exception regularly comes when we do custom development and create custom aspx pages. Everything works fine and no code issues but still this exception comes. I worked hard to fix this problem so long time. Tracked everything like logs, event viewer and more tips. Nothing helps. Then  spent some nice time and trail and error methods found the problem and fixed.

More details about exception:
No item exists at http://mysharepointsite/Pages/Home.aspx?id=4&q=HQ.  It may have been deleted or renamed by another user.
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: Microsoft.SharePoint.SPException: No item exists at http://mysharepointsite/Pages/Home.aspx?id=4&q=HQ.  It may have been deleted or renamed by another user.

Source Error:
An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below. 

What's the problem?
The problem is in my custom ASPX page, I am using a querystring with the key "id". Do you believe this? which is causing the problem?

Yes, 100% sure. This is what causing the problem. This problem came in  my two successive SharePoint projects and finally by changing the querystring key from id to someother key named like "sid" or "aid" or something other than "id" worked.

I am not really 100% sure what's happening when I use "id" key in the querystring, but by changing that everything works fine. So, don't use the querystring "id" in your cusotm SharePoint ASPX pages.

Note: There are chances that you may think the page is checked out or removed by some other user, then that's a mistake.

Hope this helps and save you from killing so much time to know the problem.