Home/ Questions/Q 6767127
In Process

The Archive Base Latest Questions

Editorial Team
  • 0
Asked: 2026-05-26T14:54:51+00:00

I was working(learning) with Data bound controls in ASP.Net and suddenly got the error:

  • 0

I was working(learning) with Data bound controls in ASP.Net and suddenly got the error:

This application is currently offline. To enable the application, remove the app_offline.htm file from the application root directory.

I started searching it on google but ended up with no helpful solution. I was not able find app_offline.htm file also. And then I suddenly tried to open my project in browser again and it opened successfully and now its working. And now I have observed that in between as I am working on the project it shows this error in between (cant say when and on what criteria) and then after some time it starts working again. Can anybody help me why its happening?

I am using ASP.Net4.0 and Sql Server Express Edition.

EDIT

With somemore searching on google it seems that this gets created automatically in the solution. If we delete it the program works fine and even if you do not delete it gets deleted after sometime by itself. but will be created again after some time.

Its hard to post any code because there is no code that is giving error. But when I press (ctrl+F5) to open my project its giving error. Still for reference I created a webform Review.aspx based on a masterpage. I created a combobox and a gridview inside it. Here Combobox has some collection of numbers (GenreId) and when you select a GenreId it do Autopostback and Gridview shows the entry associated with the selected GenreId. enter image description here

And then I tried to debug it in a browser, its giving error (for some time).

Share

Leave an answer

You must login to add an answer.

Need An Account,

1 Answer

  1. Editorial Team

    Here is the reason. have you try after closing all the design windows?

    SQL Server 2005 express edition does not support multiple processes.
    Only single process can access database at a time. So when a database
    is accessed through visual studio, ASP.net runtime cannot access the
    database. This will result into the internal server error. To prevent
    this, VS 2005 places app_offline.htm file in the application’s root
    directory. The file contain above message. This causes ASP.net to put
    the application in offline mode. Please note the accessing database
    means opening any component of the database (I.e. table, view, stored
    procedure etc.) into the design window. When design window is closed,
    VS 2005 removes app_offline.htm file making the application in onliner
    mode again.

    http://www.codeproject.com/KB/aspnet/app_offline.aspx

    • 0