Change Connection String At Runtime For Strongly Typed DataSet?
Jun 28, 2010
I need to be able to change the connection string of a strongly typed dataset at runtime. I have gone into the settings.vb page and written this code:
Namespace
My
'This class allows you to handle specific events on the settings class:
' The SettingChanging event is raised before a setting's value is changed.
' The PropertyChanged event is raised after a setting's value is changed.
' The SettingsLoaded event is raised after the setting values are loaded.
' The SettingsSaving event is raised before the setting values are saved.
[Code] .....
The way the code is suppose to work is that when a user logs in, the application gets the user's site ID (gvUserSite), then uses that to set the connection string. But when I log on with a SiteID of "21" it always uses the Case Else value. Also when I set breakpoints in settings.vb the application never stops on the breakpoints I set during runtime. As if the breakpoints were never set. Also if I put any code in the "MySettings_SettingChanging" in settings.vb I get a runtime error
"The debugger cannot continue running the process. Process was terminated.
I'm sorry but Microsoft did not think about this very well. I have used the dataset wizard to connect to my sql server and the connection string was placed in the app.config file. The only problem with this is that you can not write to it nor change string at runtime. So I need a way for each one of my users to specify their connection either during installation or after installation. I would appreciate any help in this matter.
I have a vb.net 2010 windows forms application with a strongly typed dataset. I am storing the database connection path in a txt file so that the database's location may be changed in the future for whatever reason. The typical location of the connection is the read only app.config from what I gather. I have the datasets modifier set as public but I am having trouble finding how to access the connection object for the adapter.
How do I close a connection of strongly typed dataset? I want to backup my database with a zip technique. But I can't access it when my program is open. I've closed connections of all table adapters but it didn't work.
When the user clicks an "Edit" button on my form, I want a box to come up which allows the user to edit a DataTable in a strongly-typed DataSet. What's the best way to do this?
Firstly here's the code and i will explain my problem underneath. [code...]
Now as you can see I have a variable that holds a value member of the combo box Products which is the productID of the current product selected. Then it searchers through the products datatable and once its found the correct product or not it stores the answer in slectedproductrow. next I test to see if selected product row has found the product if it has i then see if the product has already been added to the order by seraching the the customer current order datatable if it hasn't it adds the current information to the order by using selected product row.
Now the problem i get is when i add the same product it still adds the information again as currentorderrow comes back as nothing everytime even if the product has been added before but if it was in the table which it should be it should skip that bit and just go to add the current qtys toghther.Also if i go to add a diffrent product it overwrites the the other one. So i can't store the customer order. Its like i can't store more than one row. By the way I have a datagrid and can see the product get over wrriten.
Currently I am working on a project developed using VB.Net in Visual Studio 2010.Previously they were using Sql queries directly into SqlCommand of System.Data.SqlClient, but then after i shifted everything to Strongly Typed DataSet and started using TableAdapters every where..Now i just wanna ask that is this way is good for a project...Or Should i shift back to old ones using Just SqlCommands
I am trying to sqlbulkcopy. I have a dataset defined (.xsd). It seems that I cannot use it with sqlbulkcopy. All the information I can find on sqlbulkcopy shows that it can only take a connection string or a variable that contains the connection string.
I want to bind a column of a strongly typed dataset to a combobox. But the problem is i have to get only the distinct values from the column and also when a user inserts a value into that column the new value should be showned in the combobox at the same time.And also i want to make the first row of the combobox to be unselectable..[code]how to make this column distinct values
I cannot figure out for the life of me why I cannot reference a dataset table using the strongly typed name. I created a "news" table in a dataset to write out and read in a simple xml.
If you look at the code below this does not work: 'Dim TableFail As ADataSet.NewsDataTable = ds.NewsDataTable 'Does not work
I can access the table by using an untyped name however: Dim NewsTable As ADataSet.NewsDataTable = ds.Tables("News") What is the proper way of accessing the datasets 'typed' datatables name.
What is the simplest/cleanest/easiest/best way to handle Null value of a Strongly Typed DataSet in the following case :A base class has a Nullable value that is set through it's constructorThe derived class's constructor has Strongly Typed DataSet Row as parameter and it Throw exception when accessing a null value.Here a simplified example to demonstrate the problem I'm facing. Any resemblance to your code is purely coincidental.
Public MustInherit Class BaseClass Private _Number as Nullable(of integer) Public Sub New(Number as Nullable(of integer))
I am working on a project, and have defined a strongly typed dataset. Normally I create a single instance of a dataset and use through out an application. In this case I have need to clone the dataset, and clear 2 of the table and then fill those 2 tables with fake data for creating a sample report. at the end of the retuine, I dispose of the dataset. So I was think all was good.
I have a SQL Server database for which I have created a strongly-typed DataSet (using the DataSet Designer in Visual Studio 2008), so all the adapters and select commands and whatnot were created for me by the wizard.
It's a small database with largely static data, so I would like to pull the contents of this DB in its entirety into my application at startup, and then grab individual pieces of data as needed using LINQ. Rather than hard-code each adapter Fill call, I would like to see if there is a way to automate this (possibly via Reflection). [code]...
I am using a Strongly Typed Dataset as DAL. I want to return a single column from my table for that i wrote the code as
SELECT DISTINCT Floor FROM Room WHERE (Building = @Building)
But when i previewed the data, it shows me all the columns of the table with Null Value and the column with primary key has -1 value. This condition raise an Exception when i link this query to a ComboBox ..
How can I "search" through a strongly typed list for a string?
I am attempting .Contains(TheString), however it errors stating Unable to cast object of type 'System.String' to type 'o7thCrawler.Typing.ImportantTyping'
Here is the code:
Public Class LinkTyping Public Property Url As String Public Property Title As String
I'm writing a windows form application using vs2008. I need to connect to different SQL server express database files during runtime. There is a "how to do" video showing a technique for this
[Code]...
and then in the Form1_load sub and before calling the data adapter to fill data, insert codes below:
Dim strConnectingSting = NewConnectionString My.Settings.RunTimeConnectionString = strConnectingSting
The method works but only for the first database. I found once adapter.fill is called and the connection to a database is established, the connection can't be changed.To do what I want, I have to create a startup project to call my main project. When I want to change connection, close the main project and start again.
I have read through some other post and haven't been able to find an exact answer that I am looking for. I have a connection string saved in my.settings that I am using. My database is residing on a server. Now I am going to have to install this application at more then one area and they will have the database on their server. What I am wanting to do is for the application when it is loading to search the network to find the database and return the connection string without the user having to do anything. I know with a web application you can search the machine you are on for the connection string without knowing its location but was hoping there was some feature like that to search the network to find it.
I made an application that was used by one person only, but now my boss told me that this application it'll be used by all company.I made the application with a dataset that have the datasource in a access database that's installed with the application. The user can add, delete and change values in the database, so i had to put the database in a sql server to everyone see the changes.There's someway to change the dataset datasource/connection string?
You can change the connection string at run-time like this. You make the connection string setting available for writing as a separate property inside the MySettings class:
Partial Friend NotInheritable Class MySettings Public WriteOnly Property RunTimeConnectionString() Set(ByVal value)
[code]....
Then, in some place when the application is being initialized (before using any table adapters of typed datasets), write something like:
Where ProductionConnectionString is a simple String setting. It is a User Scope setting so every user can change it (by assigning a value to it, similar to the code above) and save it by calling My.Settings.Save()This code works well for connection strings which were initially created in the main project and stored in it's settings (= app.config file).
The connection string in the app.config actually has a longer name: MyApp.MySettings.MyConnectionString.When you have a connection string stored in the app.config in a class library project, and reference that project in the main project, the app.config files will somehow be merged, so the class library has it's settings.The thing that don't know how to do, is change a setting from the class library at run-time. I could copy the connection string setting from the class library to the main project's app.config. I must keep the same name, which looks something like: MyClassLibrary.My.MySettings.MyConnectionString.Can the same principle I showed above be somehow applied to this second connection string?
I have the following code compiles without issue. Of course, I get an invalid cast xception when executing the Dim C As IDoThingsC = GetThing_C(). Am I missing something?Would you ever want to return an object that does not meet the interface requirement for a function return value?
Public Class ClassA Public Sub DoThings_A() Debug.Print("Doing A things...")
I'm starting to learn ASP.NET MVC and since I work in a VB.NET shop I'm converting an example from C#. I'm trying to implement a strongly typed view and the example I'm looking at shows the following:
I'm looking for a the shortest/aseist way in VB.NET (or C# but using VB.NET at the moment) to get the string value of a method's name dynamically given the method call.For instance, I have a class like this:
Public Class Blah Public Sub Foo() End Sub End Class
Now Foo is a strongly-typed cover for a dynamic setting and I have an event handler that will fire when the setting changes and return the string name of the setting that changed.
I'd like to be able to switch/select on this string and have a case based on the Foo() method. To do this I need to able to get the string name of the Foo method from the method call itself (i.e. somehow GetMethodName(blahInstance.Foo())).
I'm wanting to have some datatables that are just used temporarily, mainly for creating and listing friendly versions of data that will be easier for the user to read in drop-down combos etc.
I would like them to be strongly typed to pick-up bugs at design-time. However I'm struggling to know how to achieve this. Do I need to create a custom class and inherit from DataTable and build the columns in the class constructor?I don't need a Dataset, just a DataTable?
I'm trying to create a strongly-typed Dictionary class in VB.NET.I'm tired of typing Dim people as Dictionary(Of String, Person)and want to make a PersonDictionary class so I can say Dim people as PersonDictionary.My reference material says to create a new class that inherits the DictionaryBase class. Then override the Add, Remove, and Item Sub/Properties.It seems like a pretty common pattern, is there an easier way?
I'm trying to pass strongly typed FaultExceptions from a WCF service to a Silverlight client but all I'm getting is the generic "The remote server returned an error: NotFound." response, while using the same code to throw generic FaultExceptions works fine. So, if I doThrow New FaultException() I get it back in the e.Error parameter of the Silverlight callback, while a Throw New FaultException(Of clsServiceFault)(clsServiceFaultInstance) results in the not found error.
clsServiceFault has already been declared as a data contract like so: <DataContract()> _ Public Enum ServiceFaultTypes LoginFailed SessionExpired End Enum [Code] .....
The WCF method in which the fault is thrown has been decorated with the FaultContract attribute and I'm also changing the HTTP response status code to 200. <OperationContract()> _ <FaultContract(GetType(clsServiceFault))> _ Public Function GetCustomersData(...) ... System.ServiceModel.Web.WebOperationContext.Current.OutgoingResponse.StatusCode = Net.HttpStatusCode.OK Throw New FaultException() 'Works Throw New FaultException(Of clsServiceFault)(new clsServiceFault(..)) 'Does not work ... End Function
I have set the connection string of my dataset(typed) asData Source=MyHomeServerSQLEXPRESS;Initial Catalog=dbTestSharing;Integrated Security=TrueThis is going to be a client side application. I need to change the machinename in the connection string so it could connect with server.
Currently we generate classes in App_Code by returning all the sprocs from all of our databases and adding the correct parameter types and names to a SqlCommand object and then returning it in one giant class. This means we can do things like MyCmd.cmd.Parameters("MyParam").Value = "whatever" when we want to pass parameters to a SqlCommand for a stored procedure without having to add the parameters with their relative data types every single time we make a call. It also means that we have to look up the exposed parameters for each sproc because they are merely strings.
To put it into perspective, for every parameter you want to deal with in a sproc you'd have to do this:
Really this is undesirable as it'd mean an Intranet/Internet application would explode into gazillions of lines of code to achieve really quite simple tasks.We're looking into refactoring this in such a way where we can do something like MyDatabase.MySproc.MyParam("value") instead by making it strongly typed. Unfortunately this means our App_Code folder will be twice the size it already is because such a large quantity of code would be required.
I've written a short example of what I mean:
Public Class MyProc Dim cmd As SqlCommand Public Sub New()
[code]....
Are there alternatives to having to do this that we are unaware of? I'm sure this is a common problem amongst many businesses developing inter/intranet applications.
