Life with 64bit OS in a 32 bit world

Question

Ok Oracle gurus can you help me with this? I have VS 2008 installed on a 64bit OS. I am troubleshooting apps for my company that were built by a developer that quit. When i go to run the app to debug it i get the following error when i try to connect via this particular app to my Oracle 10g DB. In tried this with the ODAC 10.2.0.221 and ODAC 1110621. Can i connect via this app with older versions of the ODAC if i am building in VS 2008 or doi need to use the newest ODAC? Also can someone explain this error? Thanks..
System.BadImageFormatException was unhandled
Message="Could not load file or assembly 'Oracle.DataAccess, Version=2.111.6.20, Culture=neutral, PublicKeyToken=89b483f429c47342' or one of its dependencies. An attempt was made to load a program with an incorrect format."
Source="NAClassLib"
FileName="Oracle.DataAccess, Version=2.111.6.20, Culture=neutral, PublicKeyToken=89b483f429c47342"
FusionLog="=== Pre-bind state information ===\r\nLOG: User = CIC\\khill\r\nLOG: DisplayName = Oracle.DataAccess, Version=2.111.6.20, Culture=neutral, PublicKeyToken=89b483f429c47342\n (Fully-specified)\r\nLOG: Appbase = file:///F:/DOCUMENTS/VISUAL STUDIO 2008/PROJECTS/budget/BudgetScenario/bin/Debug/\r\nLOG: Initial PrivatePath = NULL\r\nCalling assembly : NAClassLib, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null.\r\n===\r\nLOG: This bind starts in default load context.\r\nLOG: Using application configuration file: F:\\DOCUMENTS\\VISUAL STUDIO 2008\\PROJECTS\\budget\\BudgetScenario\\bin\\Debug\\BudgetScenario.vshost.exe.Config\r\nLOG: Using machine configuration file from C:\\Windows\\Microsoft.NET\\Framework64\\v2.0.50727\\config\\machine.config.\r\nLOG: Post-policy reference: Oracle.DataAccess, Version=2.111.6.20, Culture=neutral, PublicKeyToken=89b483f429c47342\r\nLOG: Attempting download of new URL file:///F:/DOCUMENTS/VISUAL STUDIO 2008/PROJECTS/budget/BudgetScenario/bin/Debug/Oracle.DataAccess.DLL.\r\nERR: Failed to complete setup of assembly (hr = 0x8007000b). Probing terminated.\r\n"
StackTrace:
at NAClassLib.DataService.DataServiceFGLAccountCompact.FGLAccountGetSpecialStringArray()
at BudgetScenarioUserControls.ucAreaOfResponsibilityView.SearchReset() in F:\DOCUMENTS\VISUAL STUDIO 2008\PROJECTS\budget\BudgetScenarioUserControls\ucAreaOfResponsibilityView.cs:line 62
at BudgetScenario.frmBudgetScenario.ucTopLevelScenario_TopLevelTreeViewItemClicked(Object sender, NAEventArgs e) in F:\DOCUMENTS\VISUAL STUDIO 2008\PROJECTS\budget\BudgetScenario\frmBudgetScenario.cs:line 105
at BudgetScenarioUserControls.ucTopLevel.TreeViewNodeSelected(TreeNode item) in F:\DOCUMENTS\VISUAL STUDIO 2008\PROJECTS\budget\BudgetScenarioUserControls\ucTopLevel.cs:line 73
at BudgetScenarioUserControls.ucTopLevel.tvTop_AfterSelect(Object sender, TreeViewEventArgs e) in F:\DOCUMENTS\VISUAL STUDIO 2008\PROJECTS\budget\BudgetScenarioUserControls\ucTopLevel.cs:line 64
at System.Windows.Forms.TreeView.TvnSelected(NMTREEVIEW* nmtv)
at System.Windows.Forms.TreeView.WmNotify(Message& m)
at System.Windows.Forms.TreeView.WndProc(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
at System.Windows.Forms.UnsafeNativeMethods.SendMessage(HandleRef hWnd, Int32 msg, IntPtr wParam, IntPtr lParam)
at System.Windows.Forms.Control.SendMessage(Int32 msg, IntPtr wparam, IntPtr lparam)
at System.Windows.Forms.Control.ReflectMessageInternal(IntPtr hWnd, Message& m)
at System.Windows.Forms.Control.WmNotify(Message& m)
at System.Windows.Forms.Control.WndProc(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
at System.Windows.Forms.UnsafeNativeMethods.CallWindowProc(IntPtr wndProc, IntPtr hWnd, Int32 msg, IntPtr wParam, IntPtr lParam)
at System.Windows.Forms.NativeWindow.DefWndProc(Message& m)
at System.Windows.Forms.TreeView.WmMouseDown(Message& m, MouseButtons button, Int32 clicks)
at System.Windows.Forms.TreeView.WndProc(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
at System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG& msg)
at System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(Int32 dwComponentID, Int32 reason, Int32 pvLoopData)
at System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context)
at System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context)
at BudgetScenario.Program.Main() in F:\DOCUMENTS\VISUAL STUDIO 2008\PROJECTS\budget\BudgetScenario\Program.cs:line 18
at System.AppDomain._nExecuteAssembly(Assembly assembly, String[] args)
at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Threading.ThreadHelper.ThreadStart()

Answer 1

I tried that already and it still gives the same error.
You tried which?
If i install a 64 bit client won't that mean my app will only run on 64bit machines?
If you build your project with "Platform target" set to "Any CPU" on a 64-bit machine the process will run as a 64-bit process and will, therefore, want the 64-bit Oracle Client. On a 32-bit machine the process will run as a 32-bit process and will, therefore, want the 32-bit Oracle Client. If you build your project with "Platform target" set to "x86" it will run as a 32-bit process on both 64-bit and 32-bit machines and will want the 32-bit Oracle Client. So, on the 64-bit machine do you have the 32-bit client or the 64-bit client? What was the "Platform target" set to when you built you application?
Regards,
Mark