Member Avatar for jellybeannn

hallo can someone please help me my Access Database ConnectionString does not work on the server

string strConnString =
            "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=|DataDirectory|calculator.mdb";
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  • Latest Post Latest Post by Gospp

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Short summary and focused troubleshooting steps that complement ’s post and ’s suggestion.

The absolute-path suggestion from is useful while debugging, but servers commonly fail for three other reasons: the Access OLE DB provider (bitness) is not available to the worker process, the web app’s account lacks file-system rights (Access needs to create lock files), or the runtime is resolving a different physical path than expected. First capture the exact exception text — that tells you which of the three buckets you’re in (provider/class-registration, file-not-found, or permission denied).

Actionable checklist

  • If the error mentions “provider” or “class not registered”: the Access engine used by desktop apps is often 32‑bit only on modern servers. Either run the App Pool in 32‑bit mode or install the 64‑bit Access Database Engine redistributable from Microsoft.
  • If it’s file-not-found: confirm the database file is deployed to the app’s data folder (or use a server-side absolute path) and that any placeholder tokens are resolving to the expected physical path.
  • If it’s permission related: grant the application pool identity read/write/modify on the folder so the engine can create/delete the locking file. See how app pool identities work in IIS for guidance.

Other notes

  • Access databases do not scale well under web load. For production sites with concurrent users, consider moving to SQL Server/Express.
  • Capture server event logs and the full exception stack trace before changing configuration; that prevents unnecessary steps.

This targets the most common server-side causes beyond the local connection string formatting that addressed.

Member Avatar for Gospp

hallo can someone please help me my Access Database ConnectionString does not work on the server

string strConnString =
            "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=|DataDirectory|calculator.mdb";

Hello.

The '|' looks a bit fishy, I think the normal syntax is '\' ??
I would recommend you to add a '@' in front of the string, as it tells the program to read the string "as is".

string strConnString = @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\temp\Nwind.mdb";

Hope it helps!

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