Member Avatar for jangojan

Dear all

i have created a small windows form application, which connect to mysql database, and the database is installed on a remote pc( virtual machine), i am using visual studio 2010 in winxp 32 bit , and i have build this application using .NET2.0, so that it can work on all version of windows later, after compiled i have made installer with the help of installshield software which is integrated inside the vs2010, after making a installer i take this to another remote machine win xp and installed there, no issue , after installing i opened my software no issue , but when i press the update button it gives me this type or error " Could not load file or assembly 'MySql.Data,' or one of its dependencies. " long error i am not able to solve this problem tried over the net but no success till now..

please help me out

regards

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  • Latest Post Latest Post by jangojan

Dani AI

Generated

As described, the app runs when started directly from the install folder or from a desktop shortcut but fails with "Could not load file or assembly 'MySql.Data'" when launched from the Start menu. Others already pointed toward missing connector assemblies; below are focused, practical diagnostics and fixes that catch the less-obvious causes installers often miss.

First, compare the working launch and the failing shortcut. A Start menu shortcut can have the wrong Target or a different "Start in" (working) folder, which changes where the runtime probes for private assemblies and native DLLs. Verify the shortcut's Target and Start in point to the folder that contains your EXE and MySql.Data.dll. If those look correct, collect hard evidence: enable the Fusion Log Viewer (fuslogvw.exe) and log bind failures, reproduce the error, then read the log to see exactly which path was probed and which dependency failed. Use Process Monitor (ProcMon) to capture file-open failures for your process — look for NAME NOT FOUND for MySql.Data.dll or libmysql.dll.

Common root causes and precise fixes:

  • Assembly probing vs working directory: ensure the installed folder actually contains MySql.Data.dll and any native libmysql.dll the connector might require.
  • Copy Local: set the MySql.Data reference property Copy Local = True in the project so the DLL is in the output.
  • Bitness mismatch: set Project -> Properties -> Compile -> Advanced Compile Options -> Target CPU appropriately (use x86 for 32-bit clients).
  • Version conflicts: check the referenced MySql.Data version vs the installed file; if unavoidable, add an assemblyBinding redirect in app.config.
  • GAC vs private assembly: avoid relying on a GAC install unless intentional — private assemblies are simpler to diagnose.

Quick checklist to follow in order:

  • Inspect the failing shortcut's Target and Start in.
  • Open the install folder and confirm presence of MySql.Data.dll and any libmysql.dll (matching bitness).
  • Run fuslogvw and ProcMon while reproducing the error; inspect logs.
  • Ensure Copy Local = True and correct Target CPU.
  • Check Event Viewer for .NET loader errors.

These steps normally reveal whether the problem is a wrong shortcut/working directory, a missing native dependency, a bitness mismatch, or an assembly-version binding failure. Thanks to , and for the initial pointers that narrowed the investigation.

Recommended Answers

All 9 Replies

Member Avatar for Momerath

You'll need to include the MySql assemblies in your install, or install them separately.

Member Avatar for jangojan

hey momerath thnx for reply indeed, but i dnt understand wht you mean to say , i have installed my mysql assemblies , connector in my system .. and where to include the assemblies ,

Member Avatar for pitic

I think Momerath is saying this:
You can either install MySql Connector on the machine where you are using the application, or include the dll files for MySql connector in your installer so they are copied over to the machine where you are installing.

Member Avatar for jangojan

dear pitic ,
i have already added the dll files in the installer , ...

Member Avatar for pitic

Did you install the MySql Connector on the machine where you are using the application? As i recall, a while back when using mysql and c# I had to install the connector everywhere.

Member Avatar for Ketsuekiame

Are the dll files being copied to the correct directory by the installer? They will need to be in the same folder as the executable. Also make sure that any dependencies that MySql.Data has are also included in the installer and get installed into the same directory as MySql.Data.

Member Avatar for jangojan

dear

agree to you , but can you tell mysql.data.dll need what dependies ,now i am facing another issue , when i install application on remote pc from the menu when i launched it gives me error, and when i open application from program files it works and even when i send apps shortcut to desktop then also it works ,, now i dnt knwo wheere i am doing wrong here ..

Member Avatar for Ketsuekiame

In Visual Studio where you are creating the installer, you should have a dependencies section where all the DLL librarys are listed. You should be able to right click this heading and select "Refresh Dependencies". This will then calculate all your dependencies and add library files if needed. Other than that, I can only suggest installing the MySQL Connector for .NET on the client machines as a seperate install time action (You may have to script it)

Additionally, make sure that the client PC has the correct version of .NET installed. Sometimes the newer operating systems don't have .NET 2.0 installed.

Member Avatar for jangojan

thnx all . .. i have sorted out this issue , i think , ,thnx for support

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