473,698 Members | 2,630 Online
Bytes | Software Development & Data Engineering Community
+ Post

Home Posts Topics Members FAQ

db Access problem

1 New Member
I'm working with a .sln that has 2 projects...one has db connectivity, the other is intended to call methods of the db-connected project. This isn't a formal 'DAL' situation but it's along those lines - 2 projects; one for data access, one for displaying data.

The class in the UI project instantiates an object in the Data project:
private MyData.MyDataPr ovider emsData = new MyData.MyDataPr ovider();

and then calls methods via:
string customerList = emsData.GetCust omerList();

The process works as long as I define a connection string in the UI App.config file...but I think I shouldn't have to carry that information in the UI project. From my perspective...a ll i'm doing is calling a method in a referenced project and db connectivity is up to _that project...not the UI project.

As soon as I remove reference from UI I get a 'Object Reference not set to an instance of an object.'

I'm using the Enterprise Library Data Block...the error is occurring in:
Database db = DatabaseFactory .CreateDatabase ();

The question is why that method wants to refer back to the calling method for the database connection string. If I call from within the data project stuff works. I thought separating responsibility as 'a good thing'.

many thankx for any thoughts.
Feb 7 '08 #1
0 761

Sign in to post your reply or Sign up for a free account.

Similar topics

11
3756
by: Wolfgang Kaml | last post by:
Hello All, I have been working on this for almost a week now and I haven't anything up my sleeves anymore that I could test in addition or change.... Since I am not sure, if this is a Windows 2003 Server or ADO or ODBC issue, I am posting this on all of the three newsgroups. That's the setup: Windows 2003 Server with IIS and ASP.NET actiavted Access 2002 mdb file (and yes, proper rights are set on TMP paths and path,
49
14340
by: Yannick Turgeon | last post by:
Hello, We are in the process of examining our current main application. We have to do some major changes and, in the process, are questionning/validating the use of MS Access as front-end. The application is relatively big: around 200 tables, 200 forms and sub-forms, 150 queries and 150 repports, 5GB of data (SQL Server 2000), 40 users. I'm wondering what are the disadvantages of using Access as front-end? Other that it's not...
0
3289
by: bettervssremoting | last post by:
To view the full article, please visit http://www.BetterVssRemoting.com Better VSS Remote Access Tool including SourceOffSite, SourceAnyWhere and VSS Remoting This article makes a detailed comparison among SourceAnyWhere, SourceOffSite, VSS Remoting and possible others.
13
4818
by: Al the programmer | last post by:
I need to access the serial ports on my webserver from an asp.net page. I have no problem accessing the serial ports from a windows form application, but the code doesn't work in asp.net. I have been told it is not possible to access the serial ports from asp.net. The application is used to control custom hardware. The hardware is connected to a PC through serial ports. Our customer wants to control the hardware from a remote...
17
2486
by: DaveG | last post by:
Hi all I am planning on writing a stock and accounts program for the family business, I understand this is likely to take close to 2 years to accomplish. The stock is likely to run into over a thousand items and the accounting side will be used for hopefully many years so the entries are likely to be vast. The delema is what is best to use ase the DB engine, Access I have as part of Office 2002 or should I really be looking at SQL...
5
2913
by: B1ackwater | last post by:
We've fooled around with Access a bit, but only using the single-user store-bought version. It seems to be a good database - versatile and infinitely programmable - and can apparently be used as a front end to SQL server if we ever needed to go that route. But - is there a client/server version of Access ? Looking on the CDW site there is a bewildering variety of packages and licences and such, but we can't figure out just which do...
34
2598
by: Mathieu Trentesaux | last post by:
Hello I downloaded Office 2007 for this reason : It seems, once again, that it is impossible to save any modification done in a VBA library, from the main project in Access. The save button remains desperatly grayed. It also seems impossible to open the library in another Access instance
21
2420
by: Bigpond News | last post by:
Work at a large site - 1000+ PC's. Mixture of Win98 & WinXP. Majority of applications using Access 97. If I compile the Acc97 application on a Win98 PC, the .mde will run perfectly on both Win98 and WinXP PC's. However, if I compile on a WinXP PC, the application doesn't run correctly on Win98 PC's. While I guess a Windows issue, does anyone know the offending files and even better, how to resolve it ? Otherwise I need to...
18
9140
by: surfrat_ | last post by:
Hi, I am having the following problems in getting Microsoft Visual Studio 2005 Professional to link to an Access .mdb database. Please help me to sort this out. Problem 1: The Microsoft page "How to: Connect to Data in an Access Database"
7
2065
by: clintonG | last post by:
To all Microsoft partners and customers who have been unable to download recently or access ASP.NET documentation from the msdn2 website and for all of those customers who have been lied to and misled by some of the sleazy MVPs and the lying cockroaches that Microsoft has working for the company... Microsoft has serious problems with their servers and websites. The entire MSDN server farm and all download resources MSDN manages has been...
0
8683
marktang
by: marktang | last post by:
ONU (Optical Network Unit) is one of the key components for providing high-speed Internet services. Its primary function is to act as an endpoint device located at the user's premises. However, people are often confused as to whether an ONU can Work As a Router. In this blog post, we’ll explore What is ONU, What Is Router, ONU & Router’s main usage, and What is the difference between ONU and Router. Let’s take a closer look ! Part I. Meaning of...
0
9031
jinu1996
by: jinu1996 | last post by:
In today's digital age, having a compelling online presence is paramount for businesses aiming to thrive in a competitive landscape. At the heart of this digital strategy lies an intricately woven tapestry of website design and digital marketing. It's not merely about having a website; it's about crafting an immersive digital experience that captivates audiences and drives business growth. The Art of Business Website Design Your website is...
1
8901
by: Hystou | last post by:
Overview: Windows 11 and 10 have less user interface control over operating system update behaviour than previous versions of Windows. In Windows 11 and 10, there is no way to turn off the Windows Update option using the Control Panel or Settings app; it automatically checks for updates and installs any it finds, whether you like it or not. For most users, this new feature is actually very convenient. If you want to control the update process,...
0
7739
agi2029
by: agi2029 | last post by:
Let's talk about the concept of autonomous AI software engineers and no-code agents. These AIs are designed to manage the entire lifecycle of a software development project—planning, coding, testing, and deployment—without human intervention. Imagine an AI that can take a project description, break it down, write the code, debug it, and then launch it, all on its own.... Now, this would greatly impact the work of software developers. The idea...
1
6528
isladogs
by: isladogs | last post by:
The next Access Europe User Group meeting will be on Wednesday 1 May 2024 starting at 18:00 UK time (6PM UTC+1) and finishing by 19:30 (7.30PM). In this session, we are pleased to welcome a new presenter, Adolph Dupré who will be discussing some powerful techniques for using class modules. He will explain when you may want to use classes instead of User Defined Types (UDT). For example, to manage the data in unbound forms. Adolph will...
0
5862
by: conductexam | last post by:
I have .net C# application in which I am extracting data from word file and save it in database particularly. To store word all data as it is I am converting the whole word file firstly in HTML and then checking html paragraph one by one. At the time of converting from word file to html my equations which are in the word document file was convert into image. Globals.ThisAddIn.Application.ActiveDocument.Select();...
0
4622
by: adsilva | last post by:
A Windows Forms form does not have the event Unload, like VB6. What one acts like?
2
2336
muto222
by: muto222 | last post by:
How can i add a mobile payment intergratation into php mysql website.
3
2007
bsmnconsultancy
by: bsmnconsultancy | last post by:
In today's digital era, a well-designed website is crucial for businesses looking to succeed. Whether you're a small business owner or a large corporation in Toronto, having a strong online presence can significantly impact your brand's success. BSMN Consultancy, a leader in Website Development in Toronto offers valuable insights into creating effective websites that not only look great but also perform exceptionally well. In this comprehensive...

By using Bytes.com and it's services, you agree to our Privacy Policy and Terms of Use.

To disable or enable advertisements and analytics tracking please visit the manage ads & tracking page.