ConnectionString For Dbf Files?

Oct 21, 2009

I use dbf files from db2k in my application.When I try to connect, it takes a long time and I find the application exited without any error msg.The connection string I use:Return "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=\agbvseng01APPLISNomenclature_Eng_Bvs;Extended Properties=dBASE IV" Data source is on a server.I dont know why this happens.



Jan 21, 2012

Dim SQLInfo As String = "server=;" _
& "uid=uid;" _
& "pwd=pwd;" _


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Where To Place ConnectionString In DA

Jan 6, 2011

I designed a DAL (data access layer). This DAL mainly consists of a handfull of methods to call stored procedures. All methods are shared. So no instance generation of the DAL class occurs.

The DAL with it's single class is located in an own project. The connection string is defined in the app-config file of this project.

I want other applications to use the DAL class by referencing the dll generated by the DAL-project. For this reason, I can not any longer define the connection string in the DAL app-config as it is,  because the client application determines which database needs to be used.

- Dropping the "shared" keyword of my methods. Create an instance of the DAL class. Add a property for the connection string. When application starts, create one global or multiple local instance/s of the DAL and set it's connection string property.

 Comment: I don't like this, because it implies more coding work on the application code side (create instance of class, assign connection string)

- Granting the DAC class access to the connection string defined in the application code by adding a connection string property inside the application code. Thus the DAC class remains "shared".

Comment: I'd need to set a reference from the DAL to the application code during without knowing the application yet. I could try stack tracing or something like that. But it feels to convoluted for me.

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Apr 27, 2011

I'm merging two of my projects that can share a lot of the same classes into one solution with two web applications and a shared class library.

I've literally just dumped all the classes into the class library project and as expected I've got a ton of errors to fix. My main problem at the moment is the connection string. Currently I have this (which is obviously not going to work):

''' <summary>
''' Initialise the data access layer by loading the database connection string from the Web.Config file


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May 22, 2012

I am just having a hard time figuring out what does the number 2 in


define? What does it mean?

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Jul 15, 2009

I've looked at a lot of posts on different forums where others have received the same error. Most say they were not referencing the connectionstring from the web.config file correctly, or they were trying to open the connection before setting the connectionstring. Well, if that were the case for me, then how does it work on two different systems, but not on the third? It works on my development PC and on the development server, but not in the production environment. The difference is the web and DB server are separate physical servers in my production environment and on a single server for development. My setup, error message and code will be listed below.

I can simulate the error on my PC if I rename the connection string in either section of the web.config file (appsettings, connectionstrings) to something else. You will see how I have tested both below.


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Jun 29, 2009

I know below code causes an error since "Property 'AAConnectionString ' is 'ReadOnly". What other choice do I have to assign a value for a user ID or a password with a value of textbox by coding?

My.Settings.AAConnectionString = "Data;Initial Catalog=aadb; Persist Security Info=True;User ID=aa123;Password=aa123"

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Apr 27, 2012

I create project in my pc with and sql database when i tried to run this project to another pc there is error occurred that the connectionstring has not been initialized. I really troubled this from last one week to solve the problem. how to change the connectionstring on client pc at runtime or any other way to create a connectionstring that has auto detect in any pc where the program is installed.

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Changing Connectionstring At Runtime

Feb 18, 2010

Im writing a app using, which has multiple front ends e.g a windows service and a windows forms app. Ive got all my business logic and database stuff compiled into 1 project (producing a dll) then the different front ends as different projects calling the dll.

In the backend / dll project Im connecting to 2 databases using app.config to store the connection strings and DataSets / TableAdapters. This all works fine .... Until

When I deploy the windows app, it deploys the exe and the dll produced by the backend project. when its installed on a client PC, Im need to point the app at a different db server and therefore need to change the connectionstring, but its packaged up in the dll.

is there any way I can use a settings file within my windows app (therefore deployed with my windows app) where I can define the connectionstring, which onload gets passsed through into my dll, so the backend connects the correct database. I know how to pass standard settings through (strings etc) but the my.settings.connectionstrings seem to be readonly.

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Aug 31, 2009

Im trying to make a query inb a dataset (to fill a report) Why it dont let me do a select (that will return rows)?

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Jul 29, 2009

How does a real life connectionString look like? I my sample application, I have this in the app.config file:


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Jan 16, 2010

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May 11, 2012

I have a web application that works perfectly on my local machine but not once Ive uploaded to the hosting server I get:
Server Error in '/' Application.
The ConnectionString property has not been initialized.
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.InvalidOperationException: The ConnectionString property has not been initialized......

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ConnectionString Property Has Not Been Initialized?

May 11, 2012

I have a web application that works perfectly on my local machine but not once Ive uploaded to the hosting server i get:Server Error in '/' Application.The ConnectionString property has not been initialized.Description: An unhandled exception occurred during the execution of the current web the stack trace for more information about the error and where it originated in the code.

Exception Details: System.InvalidOperationException: The ConnectionString property has not been initialized.Source Error:Line 423:Dim conn As New SqlConnection(connstring)


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Apr 23, 2010

When I add a datasource via the wizard the connection string is either writen directly in the dataset.designer or there is a reference to the projects settings. Either way I am figuring out if I could change it dynamicaly when my app starts up ?


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May 22, 2009

I have created a program using VB2008 it has two forms that I am having a problem with FORM2 has a textbox and a button that I use to pass a string to the code in FORM3 that is used to populate DATAGRIDVIEW1. I am using MS ACCESS 2007 for my database. I have supplied the code I am having trouble with below. When I run the program and type a string into the textbox and press the button I get this error: oledbException was unhandled: No value given for one or more required parameters. The area that was highlighted was m_daDataAdapter.Fill(ds). How can I get this code to populate the


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Nov 15, 2009

I have this now:

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Apr 22, 2011

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Jul 11, 2009

I keep getting an error that the ConnectionString is not initialized.

Here is my

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sqlDABC.SelectCommand = sqlCmd
sqlDABC.Fill(dsBC, "Supplier")

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Jun 1, 2009

I am having an issue using a datagrid.  I can use it fine on my development machine in VB 2005.  But, when I deploy it to a client and they try to access the datagrid this message comes up:To run this example, replace the value of the connectionString variable with a connection string that is valid for your system.

Both machines are running Windows XP Pro (SP3).  Is there some type of assembly for datagrids that I am missing in my application or some prerequisite that I need to install as part of the solution.

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May 21, 2009

I would like to save my connectionstring in my.settings but this property is only readonly.When i would save it as a String, then I can't find it with the wizard for building a report. [code] is there also another way to build a connectionstring? this works, but the type of My.Settings. Data base String is a string and not a ConnectionString.

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Jan 15, 2012

i get error " the connection string property has not been initialized" while inserting. am using MS access as database.

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Jun 6, 2012

my application uses a login form to connect to a remote SQL database, which uses SQL authentification. Normally, I define a connectionstring at design time which I complete with the username and password at run time.I now need to implement a ReportViewer which needs a connectionstring. I want it to use the existing connection however it obviously does not see the coded connectionstring, so I decided to add the connectionstring in app.config.

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May 23, 2011

I'm trying to use an 'SQL Express' (or is it SQL Compact?) .MDF file as the datasource on a simple website using a Chart control.

Locally, it works great; but only if the 'AttachDbFilename' has the full path. Am I messing something up, or does it really need to be full path? If so - how do I accomplish this without using something like Server.MapPath()?

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Feb 6, 2012

Changing connectionstring area of app.config in

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Apr 27, 2010

I have a VB.NET application with a connection to an SQL Server 2003. On the server there are two databases, MyDatabase and MyDatabase_Test. What I would like to do is to show a dialog when the program starts that let's the user choose which database to use. My idea is to create a new form as the starup form that sets this property and then launches the main form.Currently the connectionstring is specified in the application config file. Best would be if I can specify two different connection strings in that file to choose from, but for now it is also acceptable with other solutions like hardcoding the two connectionstrings into the startup form.EDIT: In the dataset.xsd file there seems to be the relevant part

<Connection AppSettingsObjectName="MySettings" AppSettingsPropertyName="MyDatabase_ConnectionString" ConnectionStringObject="" I


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Nov 21, 2009

i'm using VB 2010 express edition (WinForm), Microsoft access 2007 as database with username and password. Username: Admin and Password: studentdb123. My question is how do i construct  a proper connection string and modifying app.config to add username and password because i got this Error "Not a valid password" when form is loaded.

on form_load at line:
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Jun 9, 2011

I am creating an login page connected to a database. I am using access ODB. the problem is, if the user makes an wrong input, and the invalid data message box appeared, when typing the data again, and press ok, the following exeption occured:Not allowed to change the 'ConnectionString' property. The connection's current state is open.[code]

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Dec 22, 2011

I am kind of an old 'newbee' at this, so bear with me for a moment. I am developing a windows forms application in Visual Studio 2010 Professional that connects to a remote database (MS sqlServer 2008 R2).To speed up development, I configured a DataSource and used the data objects associated with it.  In VB6,
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I have been unable to find a similar method with the VS2010 Visual Basic DataSource and underlying TableAdapter, BindingSource, BindingNavigator, down to the individual ComboBox and assorted other bound controls.  It's convenient to have the integration, but I've got different users with different permissions, The long and short is that I'd like to be able to assign the data source during runtime operation, at least to the connection string level. 

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Aug 12, 2011

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<db_path>Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments) & " est.sdf"</db_path>
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May 4, 2011

I've created a solution that contains a single class library project and two web applications. My main problems are the connection strings. These are held/declared in the web projects and I'm having to pass them into the class library every time I perform any kind of data access. I sort of understand why I should do this so I'm going with it for the moment.This has now led me to a problem/question with lazy loading. I'm using lazy loading for the following property:

Public Property KeyRelationshipManager() As Employee
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Dec 20, 2011

I have console application. I would like to read the (ConnectionString) from a web.config.

Web.config is located at a particular path in my virtual PC, say "C:/mywebConfig"

<add name="MY_DB" connectionString="Data Source=DATASOURCE;Initial Catalog=DB;Persist

Security Info=False; User ID=***;Password=****;" providerName="System.Data.SqlClient" />

My code:

Dim connString As String = String.Empty
connString = ConfigurationManager.ConnectionStrings("MY_DB").ConnectionString

Whenever I try to access it, i get the error not set to an instance of an object or something like that :)

I tried to add the web.config in my Project, but still get the error.

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Mar 6, 2009

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I have used this piece of code for connecting to the database..It is showing error like The ConnectionString property has not been initialized.

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Sep 28, 2011

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Nov 11, 2011

when i got to ADODC and try to go to connectionString in the properties of ADODC, the ConnectionString Dialog Box will not open when i click on it its wants me to type some kind of text. However on tutorial it clearly states that a dialog box should open up.

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Jun 10, 2008

Once again I have hit a brick wall here. I have a combobox in which the user types the server name and then clicks on button 'CONNECT' to populate the next combobox which contains all the databases in that
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Aug 23, 2011

Dim Current As String
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If tab index is changed the sub TabSelect() is called also. One other thing is that the program checks the day of the week and correctly displays the tab corresponding to that day. On Monday this code was working fine, as soon as it hit Tuesday this error cropped up.

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