Compilation Error: The type 'ASP.global_asax' exists in both DLLs

Question

I have just integrated another project pages and its dlls into my existing project's Bin/ folder. My project framework is 3.5. When i am trying to build the project or solution, it's throwing following error:

"The type 'ASP.global_asax' exists in both 'c:\Windows\Microsoft.NET\Framework\v2.0.50727\Temporary ASP.NET Files\timesheet\15a75c54\898b48b9\assembly\dl3\58b062b2\00ceda54_c98cc801\App_global.asax.DLL' and 'c:\Windows\Microsoft.NET\Framework\v2.0.50727\Temporary ASP.NET Files\timesheet\15a75c54\898b48b9\App_global.asax.q_h6dbfx.dll' c:\Windows\Microsoft.NET\Framework\v2.0.50727\Temporary ASP.NET Files\timesheet\15a75c54\898b48b9\App_Web_admin.master.fdf7a39c.zecazgwd.0.cs "

Setting "batch=false" into web.config's is not working. I have also tried to delete all folders from "c:\Windows\Microsoft.NET\Framework\v2.0.50727\Temporary ASP.NET Files\", then clean and rebuild soultion. But still it's not working.

Solution 1

In my case the problem occurred in a virtual application's bin folder. Looking into this bin-folder you will probably see two files (an information I found here):

• App_global.asax.dll
• App_global.asax.compiled

Removing these resolves the error. The App_global.asax.dll is generated at runtime too which causes the problem. I am however still investigating how these files got there, so comments are definitely welcome!

Solution 2

I suggest you go to the path: C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\Temporary ASP.NET Files and clear the all the temporary files of your application, build your solution, and then run it!

Solution 3

In my case the problem was caused by accidentional removal of "PrecompiledApp.config". As soon as i returned the file everything started working normally.

Solution 4

I struggled with this issue in .NET 4.5 in VS2013 for a while before finding a solution that worked:

• Manually deleting the contents of the ASP.Net project's bin-folder. Clean/Rebuild was insufficient. It didn't delete enough apparently ;)

The error persisted after adding the batch="false"attribute in the compilation-element of web.config.

It also did not help to delete the ASP.Net Temporary Files-directory either.

Solution 5

In my case, i have added in my folder bin a file with name "App_global.asax.compiled" delete only this files and its work.

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Comments

[BornToCode]

A way how these files could get there is if in one of your deployments your publish settings included the setting 'Precompile during publishing'

[Alessandro]

@BornToCode You saved my day!! :)

[Chris Nevill]

In my case the Precompile during publishing option was already turned off. After deleting the files they didn't come back and the website started working again. Turning the 'Precompile' on caused the files to be generated... but the website then continued to work?!

[Morten Jensen]

As far as I can see, the author has tried this and it doesn't work. FWIW I have the same problem as the OP and deleting temp-files doesn't work, neither does setting batch=false in web.config

[MarceloBarbosa]

Weeeeee! Thank you!

[Joe 89]

After publishing using "Precompile" turned on solved this problem

[M2012]

I've same problem, I removed app_global.asax.dll file from the bin. But how these files got in bin.

[Tahir Alvi]

Thanks its works for me, before that i am struggling to fix this issue on azure environment.

[Anders Kjeldsen]

Could it be because PrecompiledApp.config is missing?

[Moslem Hadi]

I had these files in Bin folder and a 'global.asax' file in root folder. I just deleted these files and problem solved! tnx.

[Admin]

If by doing all these, you're still having the same issue, look at the references of your project. You might have a reference to that problematic dll which you need to remove. (Mine was a reference to App_Web_506b2eef.y07ibuiq)

[Uwe Keim]

Is this an error description or a solution description?

[Muhammad Bilal]

Its solutions, Make sure you have added PrecompiledApp.config on root staging as well

[more urgent jest]

this worked for me as well, whereas deleting the temp folder didn't