problem about strongly-typed-dataset-Collection of common programming errors
Kirill
asp.net datatable dataset strongly-typed-dataset dataset-designer
I use typed DataSets for accessing data, configuring them via DataSet Designer (the general idea is explained in this tutorial).For each table a GetData() method is automatically created at first. It returns a DataTable having the same schema (i.e. columns) as the underlying table in the database. If now I create a custom method using ‘Add quiery’ option, which is supposed to return only part of data (say three columns out of six), the DataTable returned by the autogenerated method still consist
Austin Salonen
c# strongly-typed-dataset
Here’s the scenario:I want to be able to support both SQL Server CE and SQL Server 200x databases using a strongly-typed dataset.The problem I’m getting is that it’s compiling using a specific type of connection (either a SqlConnection or a SqlCeConnection) so I can’t change the type at runtime to any IDbConnection object.Am I asking too much from the Visual Studio-generated datasets? If not, what’s the trick to getting it to work?
Noah
c# asp.net strongly-typed-dataset activator createinstance
I am trying to create an instance of a typed dataset dynamically in my code at runtime. I have the type available to me, but when I try to do this:object obj = Activator.CreateInstance(Type.GetType(“TYPED DATASET TYPE HERE”));The problem is the type doesn’t seem to be valid according to the code when I try and run it. What could I be doing wrong here?
havok
c# entity-framework strongly-typed-dataset
I am comparing the EF and typed datasets for their usefulness. I was failing to see why you would use the EF over typed datasets if the EF is bound to SQL Server only. But is it true that the Linq statements in EF are evaluated late in the respect that if you did something like:db.Customers.where(c => c.Name == “John Smith”)The EF would build up a query like:select * from Customers where Name = ‘John smith’But with Typed datasets you could write:bll.GetCustomers().where(c => c.Name == “Joh
svick
.net strongly-typed-dataset
What can you add to the codebehind file of a typed dataset? I thought the dataset classes were generated at runtime. The codebehind file is always an empty partial class.
this. __curious_geek
c# code-generation strongly-typed-dataset
I need to create a strongly typed dataset during run-time for the user preferred target database. Visual studio has massive design time support for creating typed datasets. I need to automate the process of generating typed datasets for the target database at runtime.It should create…1.) XSD file.2.) Typed dataset represnting the Database3.) Typed wrappers for all database tables and columns within the tables.4.) TableAdapters for each table.So I need to generate the same typed dataset at runt
Zeb-ur-Rehman
c# reflection dataset strongly-typed-dataset system.reflection
Following are the Classes in Namespace Files1. File01DataTable2. File02DataTable 3. File03DataTable4. File04DataTable5. File05DataTable6. File06DataTableNow i want to create instance at runtime. If the file is File01 then the instance of File01DataTable should be created and so on.There shouldn’t be any if else. Instead of following which is instantiating File01DataTable it should be common.File01DataTable dt = (File01DataTable)tDS.Tables[filename];I thought i can do it like this string dataTabl
Josh
c# visual-studio-2010 strongly-typed-dataset
I am working on a project with approx 75 strongly typed datasets that was upgraded from VS 2008 (which was previously upgraded from VS 2005). Visual studio crashes often while editing these datasets.Has anyone else seen this issue? Is there a workaround of any sort?
WizLiz
visual-studio-2010 crash strongly-typed-dataset
Here’s my problem : Visual studio crashed while I was developping (typical windows : Visual Studio is not responding wait/close). I Closed it and when I re-opened it I got an instant error message “failed to load dataset because of the following error : column requires a valid datatype”. I’m using 2 typed dataset and none of them want to open in the designer. I tried Restarting VS, rebooting computer, loading an old and working version of the project, open the project on another computer (using
julien
c# linq dataset strongly-typed-dataset linq-to-dataset
Here is the configuration of my datatables that I use in my linq query: I have 2 dataset files (all the columns of all the tables have a DataType specified and their AllowDbNull property set to True): * deposit_position_imbalance.xsd:Contains 2 datables : – Imbalance- ImbalanceDetailForRealTime * dep_pos_imbalance_detail.xsd:Contains 1 datatable : – TableIn the code below, the problem lies in the 2 lines “deal_date = b.deal_date”. Indeed, when I retrieve from the database b.deal_date that has a
Tim Schmelter
sql vb.net ado.net strongly-typed-dataset
I am using VB.NET 2010 (Visual Basic 2010 Express) on a WPF-based project. I am also using the SQL Server Express built-in to Visual Basic 2010 express.I have just about finished refining my code for hooking up my wpf-based form to an existing SQL database (agentroster.sdf). I have a global data source (AGENT_ROSTER) connected to this database. Connections are confirmed to work properly.This is the first part of the code I’m using, irrelevant code omitted,Dim table_adaptor As New AGENT_ROSTERTab
boomhauer
c# dataset extension-methods nullable strongly-typed-dataset
Strongly-typed DataTables support “nullable” field types, except that the designer will not allow you change the setting to “allow nulls” for any value type fields. (ie: String types allow nullable, but int’s do not). The workaround is to call IsMyFieldNull() any time you want to get Myfield. If you access MyField when it does contain a null, it throws an eception. This is a massive headache, in addition to causing many runtime bugs when a null showing up can cause your app to crash. I’ve compl
Svetlozar Angelov
web-applications sql-server-2000 constraints strongly-typed-dataset
I’m getting the following error from a VB NET web application written in VS 2003, on framework 1.1. The web app is running on Windows Server 2000, IIS 5, and is reading from a SQL server 2000 database running on the same machine. System.Data.ConstraintException:Failed to enable constraints. One ormore rows contain values violatingnon-null, unique, or foreign-keyconstraints. atSystem.Data.DataSet.FailedEnableConstraints()atSystem.Data.DataSet.EnableConstraints()atSystem.Data.DataSet.set_Enforc
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