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One of ASP.Net project runs well in debugging. However, I got a Compiler error for a deployed ASP.Net project for
using Oracle.DataAccess.Client;  // in Database_Help.cs

Compilation Error 
Description: An error occurred during the compilation of a resource required to service this request. Please review the following specific error details and modify your source code appropriately. 
Compiler Error Message: CS0246: The type or namespace name 'Oracle' could not be found (are you missing a using directive or an assembly reference?)

In this project, I have another aspx file that also uses call the oracle-related functions in the same Database_Help.cs. This page displays well.
Wish to get some help from you. Thanks.

What I have tried:

Tried multiple times in deploying my project in IIS 7.5.
Posted 5-Feb-16 1:22am
digimanus 5-Feb-16 7:38am
Is the oracle client installed on the machine?
Sanjay K. Gupta 5-Feb-16 7:38am
Upload "Oracle.ManagedDataAccess.dll" in "bin" folder
‭011111100010‬ 5-Feb-16 7:41am
You're missing files.
s yu 5-Feb-16 14:49pm
Thanks for all of you who responded my thread. I have 2 versions (distinguished here in A & B) of the project with identical codes, but they are built differently somehow. In Version A, the files in the \bin\ contain only about 1 dozen of dlls; whilst in Version B, the \bin\ folder contains significantly more files, including project.dll, project.pdb, etc. which are not in Version A. I did such a test: copy Version B's files in the \bin\ into Version A's \bin\. Then Version A works well. The oracle-related problem is gone. Actually, Verion A project was copied from Version B. T compared both project's properties and they are identical also. I could not figure out why Version A compiled differently from B's.

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