I am trying to use the File GDB API (1.2) .NET wrapper in an asp.net web service with no luck. The website will not load spitting out error: "Could not load file or assembly 'Esri.FileGDBAPI.DLL' or one of its dependencies. The specified module could not be found."

The .NET Wrapper works perfectly fine in a windows form application from my machine. Just to rule out the obvious:

  1. Esri.GileGDBAPI.dll, FileGDBAPI.dll, and FileGDBAPID.dll all are sitting in the bin of the website (along with OpenTK dll's)
  2. I have the prerequisite OpenTK installed
  3. Latest VC Runtime distributable installed.
  4. Website is targeting .NET 4.0

The fact that it runs fine in a windows form application gives me confidence that I have everything I need on my machine.

Does anyone have any other ideas and/or has anyone successfully used the .net wrapper in a .net webservice?

UPDATE: With the help of fuslogvw in the post I marked as the answer, I was able to to get the web service working after the directory containing the FileGDBAPI.dll and FileGDBAPID.dll was added to the 'Path' variable.

  • I hava this problem in ASP.NET too.I can't resolve this problem with many ways.Did you resolved this problem now?
    – user7941
    Commented Jun 1, 2012 at 17:24
  • I ultimately got it working by making sure the native dlls were in a folder in the PATH environment variable.
    – user890
    Commented Jun 2, 2012 at 0:33

2 Answers 2


Try enabling Fusion logging and inspect it with Fuslogvw to at least determine the reason for the assembly load failure: Debugging Assembly Loading Failures.


You might also try setting the application pool in which your website is running to the 32-bit mode.

The setting is called "Enable 32-bit applications" and you can find it under application pool's advanced setting in the IIS administration dashboard.

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