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Connect to Access db from VC#

Hi all,

I'm trying to connect to an MS Access database using ADO.NET and C#, but I'm
getting the dreaded "Microsoft Jet database engine cannot open the file 'x'.
It is already opened exclusively by another user, or you need permission to
view its data."

Any ideas as to why? I set up a connection using Jet 4.0 and I'm able to
open the database from within VC#.

Thanks for any help!
Jul 19 '05 #1
6 6722
P.S. I tried setting impersonation to true and now I'm getting an
"unspecifie d error"... It still doesn't work :(
"Mohammed AlQuraishi" <si******@hotma il.com> wrote in message
news:eN******** ******@TK2MSFTN GP09.phx.gbl...
Hi all,

I'm trying to connect to an MS Access database using ADO.NET and C#, but I'm getting the dreaded "Microsoft Jet database engine cannot open the file 'x'. It is already opened exclusively by another user, or you need permission to view its data."

Any ideas as to why? I set up a connection using Jet 4.0 and I'm able to
open the database from within VC#.

Thanks for any help!

Jul 19 '05 #2
Hi,

I think the problem is the ASPNET user permision.
Please refer the following link.

http://support.microsoft.com/default...;EN-US;Q316675

--
Let me know if you need further help

Regards
Sreejumon[MVP]
www.mstechzone.com

"Mohammed AlQuraishi" <si******@hotma il.com> wrote in message
news:eN******** ******@TK2MSFTN GP09.phx.gbl...
Hi all,

I'm trying to connect to an MS Access database using ADO.NET and C#, but I'm getting the dreaded "Microsoft Jet database engine cannot open the file 'x'. It is already opened exclusively by another user, or you need permission to view its data."

Any ideas as to why? I set up a connection using Jet 4.0 and I'm able to
open the database from within VC#.

Thanks for any help!

Jul 19 '05 #3
Sounds like a permissions problem.

If the .mdb file is located on the same machine as the webserver, give the
ASPNet user account Read/Write NTFS permissions to the folder that the .mdb
file is in, and the Creator/Owner user Full Control.

Cheers
Ken

"Mohammed AlQuraishi" <si******@hotma il.com> wrote in message
news:eN******** ******@TK2MSFTN GP09.phx.gbl...
: Hi all,
:
: I'm trying to connect to an MS Access database using ADO.NET and C#, but
I'm
: getting the dreaded "Microsoft Jet database engine cannot open the file
'x'.
: It is already opened exclusively by another user, or you need permission
to
: view its data."
:
: Any ideas as to why? I set up a connection using Jet 4.0 and I'm able to
: open the database from within VC#.
:
: Thanks for any help!
:
:
Jul 19 '05 #4
Well I did set impersonation to true, which, if what I gathered from the
document is correct, ought to be sufficient to resolve the problem. However,
I am getting a new error now, namely "Unspecific error has occurred"...

Any ideas? Thank you very much!

"Sreejumon[MVP]" <sr********@hot mail.com> wrote in message
news:%2******** ********@TK2MSF TNGP10.phx.gbl. ..
Hi,

I think the problem is the ASPNET user permision.
Please refer the following link.

http://support.microsoft.com/default...;EN-US;Q316675

--
Let me know if you need further help

Regards
Sreejumon[MVP]
www.mstechzone.com

"Mohammed AlQuraishi" <si******@hotma il.com> wrote in message
news:eN******** ******@TK2MSFTN GP09.phx.gbl...
Hi all,

I'm trying to connect to an MS Access database using ADO.NET and C#, but

I'm
getting the dreaded "Microsoft Jet database engine cannot open the file

'x'.
It is already opened exclusively by another user, or you need permission

to
view its data."

Any ideas as to why? I set up a connection using Jet 4.0 and I'm able to
open the database from within VC#.

Thanks for any help!


Jul 19 '05 #5
Well I have an dbOleConnection object set at design time to:

Provider=Micros oft.Jet.OLEDB.4 .0;Password=""; User ID=Admin;Data
Source=C:\Inetp ub\wwwroot\Flow s\db1.mdb;Mode= ReadWrite|Share Deny
None;Extended Properties="";J et OLEDB:System database="";Jet OLEDB:Registry
Path="";Jet OLEDB:Database Password="";Jet OLEDB:Engine Type=5;Jet
OLEDB:Database Locking Mode=1;Jet OLEDB:Global Partial Bulk Ops=2;Jet
OLEDB:Global Bulk Transactions=1; Jet OLEDB:New Database Password="";Jet
OLEDB:Create System Database=False; Jet OLEDB:Encrypt Database=False; Jet
OLEDB:Don't Copy Locale on Compact=False;J et OLEDB:Compact Without Replica
Repair=False;Je t OLEDB:SFP=False

And my dummy function simply tries to open the oleDbConnection object by
invoking the Open method. That's it.

This is the error I'm getting:
Server Error in '/Flows' Application.
----------------------------------------------------------------------------
----

Unspecified error
Description: An unhandled exception occurred during the execution of the
current web request. Please review the stack trace for more information
about the error and where it originated in the code.

Exception Details: System.Data.Ole Db.OleDbExcepti on: Unspecified error

Source Error:

Line 62: private void Button1_Click(o bject sender, System.EventArg s e)
Line 63: {
Line 64: oleDbConnection 1.Open();
Line 65: System.Data.Ole Db.OleDbDataRea der myReader =
oleDbCommand1.E xecuteReader();
Line 66: while (myReader.Read( ))

Source File: c:\inetpub\wwwr oot\flows\webfo rm1.aspx.cs Line: 64

Stack Trace:

[OleDbException (0x80004005): Unspecified error]
System.Data.Ole Db.OleDbConnect ion.ProcessResu lts(Int32 hr)
System.Data.Ole Db.OleDbConnect ion.InitializeP rovider()
System.Data.Ole Db.OleDbConnect ion.Open()
Flows.WebForm1. Button1_Click(O bject sender, EventArgs e) in
c:\inetpub\wwwr oot\flows\webfo rm1.aspx.cs:64
System.Web.UI.W ebControls.Butt on.OnClick(Even tArgs e)

System.Web.UI.W ebControls.Butt on.System.Web.U I.IPostBackEven tHandler.RaiseP o
stBackEvent(Str ing eventArgument)
System.Web.UI.P age.RaisePostBa ckEvent(IPostBa ckEventHandler
sourceControl, String eventArgument)
System.Web.UI.P age.RaisePostBa ckEvent(NameVal ueCollection postData)
System.Web.UI.P age.ProcessRequ estMain()


Thanks again for any help!
"Sreejumon[MVP]" <sr********@hot mail.com> wrote in message
news:OV******** *****@TK2MSFTNG P12.phx.gbl...
Could you please send your code snippet ?

--
Let me know if you need further help

Regards
Sreejumon[MVP]
www.mstechzone.com

"Mohammed AlQuraishi" <si******@hotma il.com> wrote in message
news:#m******** ******@TK2MSFTN GP12.phx.gbl...
Well I did set impersonation to true, which, if what I gathered from the
document is correct, ought to be sufficient to resolve the problem. However,
I am getting a new error now, namely "Unspecific error has occurred"...

Any ideas? Thank you very much!

"Sreejumon[MVP]" <sr********@hot mail.com> wrote in message
news:%2******** ********@TK2MSF TNGP10.phx.gbl. ..
Hi,

I think the problem is the ASPNET user permision.
Please refer the following link.

http://support.microsoft.com/default...;EN-US;Q316675

--
Let me know if you need further help

Regards
Sreejumon[MVP]
www.mstechzone.com

"Mohammed AlQuraishi" <si******@hotma il.com> wrote in message
news:eN******** ******@TK2MSFTN GP09.phx.gbl...
> Hi all,
>
> I'm trying to connect to an MS Access database using ADO.NET and C#, but I'm
> getting the dreaded "Microsoft Jet database engine cannot open the file 'x'.
> It is already opened exclusively by another user, or you need permission to
> view its data."
>
> Any ideas as to why? I set up a connection using Jet 4.0 and I'm
able to > open the database from within VC#.
>
> Thanks for any help!
>
>



Jul 19 '05 #6
You've got to be kidding me! That's all I had to do!!!!

Why on earth do they make it so difficult? Such a simple task and it took me
a whole day! Wow thank you very much! Really appreciate the help!!!

Mohammed

"Ken Schaefer" <ke*******@THIS adOpenStatic.co m> wrote in message
news:eW******** ******@tk2msftn gp13.phx.gbl...
You may need to disable "Simple File Sharing"

Open an Explorer Window, got Tools -> Folder Options -> Scroll down to the
button -> Uncheck "Use Simple File Sharing"

Then, when you right-click ona folder, you should have a "security" option now where you can set NTFS permissions (assuming that your drive is
formatting NTFS, not FAT32).

Cheers
Ken
"Mohammed AlQuraishi" <si******@hotma il.com> wrote in message
news:OI******** ******@TK2MSFTN GP12.phx.gbl...
: Yes it is in fact on the same machine, but I'm running XP Pro, so the
: permissions should already be taken care of, no? If not where do I change : it? (XP hides a lot of the stuff that Win2k exposes)
:
: Thanks for your help!
:
: "Ken Schaefer" <ke*******@THIS adOpenStatic.co m> wrote in message
: news:%2******** ********@TK2MSF TNGP10.phx.gbl. ..
: > Sounds like a permissions problem.
: >
: > If the .mdb file is located on the same machine as the webserver, give
the
: > ASPNet user account Read/Write NTFS permissions to the folder that the
: .mdb
: > file is in, and the Creator/Owner user Full Control.
: >
: > Cheers
: > Ken
: >
: > "Mohammed AlQuraishi" <si******@hotma il.com> wrote in message
: > news:eN******** ******@TK2MSFTN GP09.phx.gbl...
: > : Hi all,
: > :
: > : I'm trying to connect to an MS Access database using ADO.NET and C#,
but
: > I'm
: > : getting the dreaded "Microsoft Jet database engine cannot open the
file
: > 'x'.
: > : It is already opened exclusively by another user, or you need
permission
: > to
: > : view its data."
: > :
: > : Any ideas as to why? I set up a connection using Jet 4.0 and I'm able to
: > : open the database from within VC#.
: > :
: > : Thanks for any help!
: > :
: > :
: >
: >
:
:

Jul 19 '05 #7

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