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  • should I use Entity Framework instead of raw ADO.NET

    - by user110182
    I am new to CSLA and Entity Framework. I am creating a new CSLA / Silverlight application that will replace a 12 year old Win32 C++ system. The old system uses a custom DCOM business object library and uses ODBC to get to SQL Server. The new system will not immediately replace the old system -- they must coexist against the same database for years to come. At first I thought EF was the way to go since it is the latest and greatest. After making a small EF model and only 2 CSLA editable root objects (I will eventually have hundreds of objects as my DB has 800+ tables) I am seriously questioning the use of EF. In the current system I have the need many times to do fine detail performance tuning of the queries which I can do because of 100% control of generated SQL. But it seems in EF that so much happens behind the scenes that I lose that control. Article like http://toomanylayers.blogspot.com/2009/01/entity-framework-and-linq-to-sql.html don't help my impression of EF. People seem to like EF because of LINQ to EF but since my criteria is passed between client and server as criteria object it seems like I could build queries just as easily without LINQ. I understand in WCF RIA that there is query projection (or something like that) where I can do client side LINQ which does move to the server before translation into actual SQL so in that case I can see the benefit of EF, but not in CSLA. If I use raw ADO.NET, will I regret my decision 5 years from now? Has anyone else made this choice recently and which way did you go?

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  • should I use Entity Framework instead of raw ADO.NET

    - by user110182
    I am new to CSLA and Entity Framework. I am creating a new CSLA / Silverlight application that will replace a 12 year old Win32 C++ system. The old system uses a custom DCOM business object library and uses ODBC to get to SQL Server. The new system will not immediately replace the old system -- they must coexist against the same database for years to come. At first I thought EF was the way to go since it is the latest and greatest. After making a small EF model and only 2 CSLA editable root objects (I will eventually have hundreds of objects as my DB has 800+ tables) I am seriously questioning the use of EF. In the current system I have the need many times to do fine detail performance tuning of the queries which I can do because of 100% control of generated SQL. But it seems in EF that so much happens behind the scenes that I lose that control. Article like http://toomanylayers.blogspot.com/2009/01/entity-framework-and-linq-to-sql.html don't help my impression of EF. People seem to like EF because of LINQ to EF but since my criteria is passed between client and server as criteria object it seems like I could build queries just as easily without LINQ. I understand in WCF RIA that there is query projection (or something like that) where I can do client side LINQ which does move to the server before translation into actual SQL so in that case I can see the benefit of EF, but not in CSLA. If I use raw ADO.NET, will I regret my decision 5 years from now? Has anyone else made this choice recently and which way did you go?

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  • What's slowing for loops/assignment vs. C?

    - by Lee
    I have a collection of PHP scripts that are extremely CPU intensive, juggling millions of calculations across hundreds of simultaneous users. I'm trying to find a way to speed up the internals of PHP variable assignment, and looping sequences vs C. Although PHP is obviously loosely typed, is there any way/extension to specifically assign type (assign, not cast, which seems even more expensive) in a C-style fashion? Here's what I mean. This is some dummy code in C: #include <stdio.h> int main() { unsigned long add=0; for(unsigned long x=0;x<100000000;x++) { add = x*59328409238; } printf("x is %ld\n",add); } Pretty self-explanatory -- it loops 100 million times, multiples each iteration by an arbitrary number of some 59 billion, assigns it to a variable and prints it out. On my Macbook, compiling it and running it produced: lees-macbook-pro:Desktop lee$ time ./test2 x is 5932840864471590762 real 0m0.266s user 0m0.253s sys 0m0.002s Pretty darn fast! A similar script in PHP 5.3 CLI... <?php for($i=0;$i<100000000;$i++){ $a=$i*59328409238; } echo $a."\n"; ?> ... produced: lees-macbook-pro:Desktop lee$ time /Applications/XAMPP/xamppfiles/bin/php test3.php 5.93284086447E+18 real 0m22.837s user 0m22.110s sys 0m0.078s Over 22 seconds vs 0.2! I realize PHP is doing a heck of a lot more behind the scenes than this simple C program - but is there any way to make the PHP internals to behave more 'natively' on primitive types and loops?

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  • setup Zyxel USG 20W as L2TP VPN Server

    - by Massimo
    I've a Zywall USG 20W (wireless disabled) behind a router supplied by the ISP. All ports (both TCP and UDP) on the ISP router are forwarded to the 20W. I'm trying to configure an L2TP VPN to be used by Windows Xp / 7 with Microsoft native client. This was working before with a different firewall, so I'm pretty sure that all the required packets are flowing to the 20W. I followed a tutorial from the italian Zyxel Website, but I cannot get the VPN to work. Always cannot pass phase 2, and I see the following on the log: [ID]: Tunnel [Default_L2TP_VPN_Connection] Phase 2 local policy mismatch Phase 1 goes fine. In Windows the error is always 788. This happens regardless the proposals I set in the phase 1 and 2 setting. What should I check ? Is there any way to get more detailed diagnostic info (policy mismatch is too generic) ? Thanks a lot to whom may help. Massimo.

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  • dns service on OS X Snow Leopard Server

    - by Sorin Buturugeanu
    Hello all, I have a Mac Mini (1.83GHz, 1.5 RAM) with a fresh install of OS X Snow Leopard Server and I want to use it for DNS and web hosting. What I have done so far is to go to the domain registrar and configure a new nameserver (ns.domain.tld) to point to my static IP. This Mac Mini is behind a DI-524 router and I have forwarded ports 53 and 80 to the Mini. I have also added the domain name to the DNS configuration pannel (as in the attachment), but intodns.com gives the following error (among others, and obviously the site is not working): "Mismatched NS records WARNING: One or more of your nameservers did not return any of your NS records." I don't know where to go from here .. Thank you to anyone willing to take the time to give me a hint!! seems that I can't post images but here's the link: http://i.imgur.com/zWI7Y.png

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  • What are Subnet Mask and Gateway exactly

    - by Saif Bechan
    I have a dedicated server with multiple IP adresses. I run them on Plesk but some of the names are confusing me. One ip has a subnet mask of 225.225.225.192, another has 225.225.225.0. What does this mean and what happens if i change that. Another thing i got a gateway. What is that and when will that come in handy. Another thing I see sometimes behind the ip's is /number. For example: 200.20.20.20/24 200.20.20.20/16 200.20.20.20/8 What will these numbers say.

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  • Is HAProxy able to pass SSL requests to Apache + mod_ssl?

    - by Josh Smeaton
    Most of the documentation I've read regarding HAProxy and SSL seems to suggest that SSL must be handled before it reaches HAProxy. Most solutions focus on using stunnel, and a few suggest Apache + mod_ssl infront of HAProxy. Our problem though, is that we use Apache as a reverse proxy to a number of other sites which use their own certificates. Ideally what we'd like, is for HAProxy to pass all SSL traffic to Apache, and let Apache handle either the SSL or reverse proxying. Our current setup: Apache Reverse Proxy -> Apache + mod_ssl -> Application What I'd like to do: HAProxy -> Apache Reverse Proxy -> Apache + mod_ssl -> Application Is it possible to do this? Is HAProxy capable of forwarding SSL traffic to be handled by a server BEHIND it?

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  • TeamViewer cannot connect

    - by Cetin Sert
    Last week I decided to use TeamViewer VPN to administer software on a server behind a firewall using RemoteDesktop. It was easy to configure to start-up with the system and make VPN available on the other side but now it fails to connect at the step shown below: The remote machine is running Windows Server 2008 R2. Is there a native way to circumvent the external firewall using a server role or feature to make Windows Server do the VPN work? Do people have better / more reliable experiences with other products such as Hamachi? The requirements are as follows: Start at remote system start-up time Make VPN connections to the remote machine possible

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  • TwoWay Binding With ItemsControl

    - by Andrew
    I'm trying to write a user control that has an ItemsControl, the ItemsTemplate of which contains a TextBox that will allow for TwoWay binding. However, I must be making a mistake somewhere in my code, because the binding only appears to work as if Mode=OneWay. This is a pretty simplified excerpt from my project, but it still contains the problem: <UserControl x:Class="ItemsControlTest.UserControl1" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Height="300" Width="300"> <Grid> <StackPanel> <ItemsControl ItemsSource="{Binding Path=.}" x:Name="myItemsControl"> <ItemsControl.ItemTemplate> <DataTemplate> <TextBox Text="{Binding Mode=TwoWay, UpdateSourceTrigger=LostFocus, Path=.}" /> </DataTemplate> </ItemsControl.ItemTemplate> </ItemsControl> <Button Click="Button_Click" Content="Click Here To Change Focus From ItemsControl" /> </StackPanel> </Grid> </UserControl> Here's the code behind for the above control: using System; using System.Windows; using System.Windows.Controls; using System.Collections.ObjectModel; namespace ItemsControlTest { /// <summary> /// Interaction logic for UserControl1.xaml /// </summary> public partial class UserControl1 : UserControl { public ObservableCollection<string> MyCollection { get { return (ObservableCollection<string>)GetValue(MyCollectionProperty); } set { SetValue(MyCollectionProperty, value); } } // Using a DependencyProperty as the backing store for MyCollection. This enables animation, styling, binding, etc... public static readonly DependencyProperty MyCollectionProperty = DependencyProperty.Register("MyCollection", typeof(ObservableCollection<string>), typeof(UserControl1), new UIPropertyMetadata(new ObservableCollection<string>())); public UserControl1() { for (int i = 0; i < 6; i++) MyCollection.Add("String " + i.ToString()); InitializeComponent(); myItemsControl.DataContext = this.MyCollection; } private void Button_Click(object sender, RoutedEventArgs e) { // Insert a string after the third element of MyCollection MyCollection.Insert(3, "Inserted Item"); // Display contents of MyCollection in a MessageBox string str = ""; foreach (string s in MyCollection) str += s + Environment.NewLine; MessageBox.Show(str); } } } And finally, here's the xaml for the main window: <Window x:Class="ItemsControlTest.Window1" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:src="clr-namespace:ItemsControlTest" Title="Window1" Height="300" Width="300"> <Grid> <src:UserControl1 /> </Grid> </Window> Well, that's everything. I'm not sure why editing the TextBox.Text properties in the window does not seem to update the source property for the binding in the code behind, namely MyCollection. Clicking on the button pretty much causes the problem to stare me in the face;) Please help me understand where I'm going wrong. Thanx! Andrew

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  • OSX pdf-kit vs Linux poppler or pdf/x

    - by Tahnoon Pasha
    I keep reading and hearing that the reason that there is no good pdf editing software for Linux is that the libraries are not as well developed. That is why there is no equivalent for Skim or Preview in Linux. I had a look a the pdf-kit documentation and the poppler documentation and they looked very similar to my admittedly non-technical view. Could someone explain to me why the OSX libraries (eg) are so much easier to write projects like Skim in than the linux ones. I'm not sure if the same applies to OSX projects to NVAlt, but it seems to be a common theme - I'd just like to understand what is behind the thesis that OSX is easier to code these projects in, and what would be involved in changing it. (I'm not disputing the value of Okular or Evince and the like, just noting that they don't have the richness of functionality of Skim, Preview or even things like Goodreader on the Ipad).

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  • VMWare ESX Updates - Which to Apply?

    - by Aaron Alton
    Wondering what more experienced ESX admins typically do... I just brought our ESX hosts up to 3.5 Update 5 (Yes, I know we're behind still). I then applied the "Critical Host Updates" baseline in VMWare update manager, and found that we're still short on 14 "critical updates". My question is, do most people go ahead and apply any update flagged as critical, or do they evaluate each update one-by-one to determine whether or not the issue that has been addressed is likely to affect them. In the SQL Server world (my alma mater, so to speak), we regularly apply service packs, and sometimes cumulative updates, but we only apply hotfixes when the issue that they are targeted towards affects us. Does the same logic hold fast in VMWare land?

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  • Nginx Fastcgi performance issues

    - by Barry
    I am running several fastcgi servers behind Nginx. I run 3 Nginx workers and 6 fastcgi servers as upstream backends. When I run load tests of 1 req per sec, I can clearly see that on avarage a reply is 0.1sec, but from time to time there are 3.1 sec responses. It is a suspiciously deterministic number and it happens even at very small loads from time to time. Both CPU and Memory are of no issue at all. Any idea where this delay may be comming from? Any suggestions how to debug this? Many thanks, Barry.

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  • Switch smarthosts in Exchange when using dual WAN

    - by mat0ng
    Hi everybody, I'd like to know if it's possible to setup Exchange 2003/2007 to switch between smarthosts, based on the WAN connection currently in use. Example scenario: I have two WAN connections with different ISP's. Exchange is running behind a dual WAN router. The router is setup to fall back to secondary WAN when primary WAN fails. The smarthost set in Exchange is the SMTP server of the primary ISP. Because the smarthost set in Exchange only allows relaying from IP's of the primary WAN sending mail won't work when the router falls back to the secondary WAN. Sending mail directly through DNS MX lookup is an option but the ISP's have dynamic IP's that get blacklisted a lot. Thanks in advance!

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  • Cannot uninstall Office Live Add-in 1.4 after installing Office 2010

    - by Shevek
    Last night I upgraded to Office 2010 RTM from MSDN. I'm now trying to uninstall the Office Live Add-in that I used with Office 2007 as this functionality is built in to Office 2010. When I run the uninstall from control panel I get the following message: Microsoft Office Live Add-in cannot be installed because you do not have the right version of Microsoft Office installed on your computer Google has pointed to 2 solutions, both of which are pretty useless: Use the MS Windows Installer Cleanup - this is not good because all it does is remove the Installer entry from the registry, leaving all the installed files behind Uninstall Office 2010, uninstall Add-in, reinstall Office 2010 - that is just rediculous, but typical MS response So, can I get this off my system without resorting to option 2?

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  • DNS Server and Private HTTP / SOCKS Proxy

    - by DucDigital
    Hi every one, this is just a small hacking attemp to our router. I'm trying to setup a small DNS and forward webpages through proxy behind the scene. I've successfully implement the DNS server that will do the resolving or anything involved in address resolve. But is there anyway I can forward the user using DNS to a proxy instead of request directly to the server? Are there any software/opensource that I can use? I notice on paid wireless, they can provide a login page if user is not login yet, i think this is a way of implementing proxy. Also the hardware is very basic with linksys and netgear router which connect directly to the internet. It's a basic LAN

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  • DNS Server and Private HTTP / SOCKS Proxy

    - by DucDigital
    Hi every one, this is just a small hacking attemp to our router. I'm trying to setup a small DNS and forward webpages through proxy behind the scene. I've successfully implement the DNS server that will do the resolving or anything involved in address resolve. But is there anyway I can forward the user using DNS to a proxy instead of request directly to the server? Are there any software/opensource that I can use? I notice on paid wireless, they can provide a login page if user is not login yet, i think this is a way of implementing proxy. Also the hardware is very basic with linksys and netgear router which connect directly to the internet. It's a basic LAN

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  • WPF Update Binding when Bound directly to DataContext w/ Converter

    - by Adam
    Normally when you want a databound control to 'update,' you use the "PropertyChanged" event to signal to the interface that the data has changed behind the scenes. For instance, you could have a textblock that is bound to the datacontext with a property "DisplayText" <TextBlock Text="{Binding Path=DisplayText}"/> From here, if the DataContext raises the PropertyChanged event with PropertyName "DisplayText," then this textblock's text should update (assuming you didn't change the Mode of the binding). However, I have a more complicated binding that uses many properties off of the datacontext to determine the final look and feel of the control. To accomplish this, I bind directly to the datacontext and use a converter. In this case I am working with an image source. <Image Source="{Binding Converter={StaticResource ImageConverter}}"/> As you can see, I use a {Binding} with no path to bind directly to the datacontext, and I use an ImageConverter to select the image I'm looking for. But now I have no way (that I know of) to tell that binding to update. I tried raising the propertychanged event with "." as the propertyname, which did not work. Is this possible? Do I have to wrap up the converting logic into a property that the binding can attach to, or is there a way to tell the binding to refresh (without explicitly refreshing the binding)? Any help would be greatly appreciated. Thanks! -Adam

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  • Firefox extension to dinamically change superbar icon, similar to windows live messenger.

    - by D Connors
    With seven's new superbar, windows live messenger is now able to display your status on the bar's icon (and not on the system tray). So that got me thinking, maybe a firefox extension could do something similar. Therefore, here's my question to those who understand the workings and spinning wheels behind firefox extensions: could a firefox extension change the superbar icon to display some useful info? Does the current functionality support it? EDIT: I think my question is not really clear. I just want to know if it's theoritically possible for a firefox addon to change the superbar icon dinamically. For instance, windows live messenger changes the icon acording to your status, and gmail notifier plus changes the icon according to your unread messages count. I'm just wondering if firefox as it is right now supports an extension with that functionality. I know that no current extensions do it, and I'm not looking for a gmail notifier (that was just an example). thanks

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  • The proxy server received an invalid response from an upstream server

    - by chandank
    I have tomcat server behind the apache. I am using mod_ssl and reverse proxy to the tomcat. All are running at default ports. The full error is as follow. ack Proxy Error The proxy server received an invalid response from an upstream server. The proxy server could not handle the request POST /pages/doeditpage.action. Reason: Error reading from remote server If I clean the browser cache the error goes away and comes back after few attempts. I test the same on Chrome/Firefox/IE on Windows platform. Wondering it works perfectly on Linux based Chrome/Firefox. I googled a lot there are few answers at stack overflow but I am not able to find my answer. Is this a server side problem? because so many browsers cant be wrong at same time on Windows.

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  • How to create tunnel to utilize for telnet connection.

    - by Z12
    The scenario is as follows: Machine A is located behind client firewall. The machine runs telnetd. This is Linux machine with Python 2.5.4 installed. I do not know the IP addy of the router and firewall is not open incoming. outgoing firewall is open. Machine B (Windows machine) is a server with well known IP address. I can install any programs I want on either machine. The idea is that I want Machine A to open a socket to machine B. Then I want to hold that socket and use to run a telnet session from Machine B to Machine A telnetd server. Is there any freeware that does this? Thoughts? Thanks!

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  • QoS / PBR Routing Questions

    - by Bernard
    I have a 50Mbs Satellite link and a 10Mbs Microwave link supplying a very remote location. Behind these links, I have a 6,400 seat network - with about 3,000 signed in at any one time. My goal is to send all of the Voip traffic (Google Chat, Magic Jack, Skype, Speakeasy, Vonage, Vonage PC, Yahoo) through the microwave link which has 100ms latency. The rest of the traffic can utilize any remaining bandwidth of the microwave link with excess being diverted to the higher latency (600ms) satellite connection. The problem I've had so far is that most automatic routing configurations weigh the bandwidth heavily for preference - and I'm only wanting latency considered. Additionally, I don't know if this can even be handled with the routing hardware I have at my disposal (Cisco 3640, 3745, & 3845). Any recommendations (or really good starting points) would be greatly appreciated.

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  • Apache error_log showing which command output

    - by Unai Rodriguez
    Apache's error_log shows lines like the following: --- snip --- which: no ruby in (/sbin:/usr/sbin:/bin:/usr/bin) which: no locate in (/sbin:/usr/sbin:/bin:/usr/bin) which: no suidperl in (/sbin:/usr/sbin:/bin:/usr/bin) which: no get in (/sbin:/usr/sbin:/bin:/usr/bin) which: no fetch in (/sbin:/usr/sbin:/bin:/usr/bin) which: no links in (/sbin:/usr/sbin:/bin:/usr/bin) which: no lynx in (/sbin:/usr/sbin:/bin:/usr/bin) which: no lwp-mirror in (/sbin:/usr/sbin:/bin:/usr/bin) which: no lwp-download in (/sbin:/usr/sbin:/bin:/usr/bin) which: no kav in (/sbin:/usr/sbin:/bin:/usr/bin) --- end --- The architecture is: Internet - Load Balancer - Varnish - Apache There are several web servers behind the load balancer and I have checked at least one of them with rkhunter (link) and couldn't find anything suspicious. Versions: CentOS 5.7 Varnish 2.1.5 Apache 2.2.3 PHP 5.2.17 Does this mean that someone has executed the command which through Apache? How can that happen? Thank you so much.

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  • OpenVPN performance: how many concurrent clients are possible?

    - by Steffen Müller
    I am evaluating a system for a client where many OpenVPN clients connect to a OpenVPN server. "Many" means 50000 - 1000000. Why do I do that? The clients are distributed embedded systems, each sitting behind the system owners dsl router. The server needs to be able to send commands to the clients. My first naive approach is to make the clients connect to the server via an openvpn network. This way, the secure communication tunnel can be used in both directions. This means that all clients are always connected to the server. There are many clients summing up over the years. The question is: does the OpenVPN server explode when reaching a certain number of clients? I am already aware of a maximum TCP connection number limit, therefore (and for other reasons) the VPN would have to use UDP transport. OpenVPN gurus, what is your opinion?

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  • Acer Aspire ASE700-UQ660A will not respond to power button

    - by Tim R.
    This is something of a continuation of this question. I am now completely unable to boot this computer. The last time I used it, I used hibernation mode. When I needed to use it again, it would not respond at all to the power button, keyboard, or mouse. I tried: Holding down the power button for 15 seconds pressing the power button Unplugging the power cord for 30 seconds, plugging it back in, and trying again Removing the motherboard battery for over a minute and reinstalling it Before removing the motherboard battery, none of the lights on the front of the computer lit up. After reinstalling the battery and plugging the power cord back in, the light behind the power button is constantly illuminated (without even pressing the power button), but there is still no response to the power button, no fans turned on, nothing else that would indicate that it is running. System: Acer Aspire ASE700-UQ660A (Specs should be all factory defaults except:) 4 GB RAM Nvidia GeForce 8600 GT with driver version 197.45 Windows 7 Professional 64 bit

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  • ADODB Connection String: Workgroup Information file is Missing?

    - by Mohgeroth
    I have a few data sources in access that I need to connect to programatically to do things with behind the scenes and keep visibility away from users. Said datasource has a password 'pass' as I'm going to call it here. Using this connection method I get an error attempting to use the open method Dim conn as ADODB.Connection Set ROBBERS.conn = New ADODB.Connection conn.open "Provider=Microsoft.Jet.OLEDB.4.0;" _ & "Data Source=\\pep-home\projects\billing\autobilling\DPBilling2.mdb;" _ & "Jet OLEDB:Database Password=pass;", "admin", "pass" "Cannot start your application. The workgroup information file is missing or opened exclusively by another user." Due to planning to move into 2007, we are not using nor have ever used a workgroup identification file through access. The database password on the data source was set through the Set Databa Password which had to be done on an exclusive open. Ive spent a good while changing around my connection options, where to put the passwords etc and either cannot find the right format, or (why I'm asking here) I think there may be some other unknown that I must setup to do this. Anyone out there got some useful information?

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