Hi, I have a very simple situation. I have class with a property that returns an Interface type. For example: class Person { public IPersonName Name { get{return name;} } public PersonName RealName { get {return name as PersonName;} } } Th...more >>

Microsoft has a 5 minute video showing how to create a one-to-many form using drag and drop controls from the Data Sources window. (http://msdn2.microsoft.com/en-us/vbasic/bb643827.aspx). I=92m trying to create almost the exact same form, except for one small change. Instead of dragging the man...more >>

Jim, the solution to your problem is this: Handle the LeftMouseButtonUp event and check to see if the following two conditions are true: - the e.Handled parameter passed to your routed event handler is false - the grid's SelectedItem is null You can do something similar to for if the user pre...more >>

PerformanceCounterCategory.Create() takes 3 minutes to add a new category!! How come? What can cause this? ...more >>

I would like to take the values from the cells in a selected row of a datagrid on one form and display it in a separate form for editing. How could I bind the textboxes of the second form (form2) to the DataGridView.SelectedCells[i].Value on the first form (form1)?...more >>

Hi everyone, I have one dataset that gets built dynamically from XML, I parse a large soap message and extract the schema from XML( I am working in .NET 1.0, sorry for the pain). anyway, by default the dataset resutling from this process has a data type of string for all columns. My question is...more >>

VS2005 pro The short question is this: How do I hide public properties of my class from binding in a datagrid for example. Setting <Browsable(false)> will not work since I have to bind to these properties in some win forms. In need the property available when binding, but not to display in ...more >>

I've got to ask, why in the world would you want to use DAO and the Data Control?! To me that just sounds like throwing out my calculator and using an abacus. "Scotty" <matthieu.sarthou@googlemail.com> wrote in message news:cbb0be9e-75e9-436d-b3d9-748f95762065@s50g2000hsb.googlegroups.co...more >>

Databinding has existed since the first version of .Net. PropertyGrid isn't a true databound control in the same sense that DataGridView is for example. As a consequence it doesn't use the INotifyPropertyChanged or <property>Changed events exposed by various objects. PropertyGrid needs to...more >>

I have used data binding in .Net 2.0 and love it, from what I understand what I used in 2.0 was new. Today I am working with .Net 1.1 and wondering how to wire things up correctly... There is a PropertyGrid that has had it's SelectedObject set to a data class. From time to time the values of...more >>

I hope someone can help me. I have 2 tables, school master and school type with school type being a subset of school master. I want to load the school master record into a form and have the school type be a drop down box showing the description from the school type table. I have done th...more >>

Hi Jakob, The Attach/AttachAll method is usually used in the scenario where the entity objects are serialized to client over a network and detached from their data context and the clients require to update or delete data. Note that only call the Attach methods on new or deserialized entiti...more >>

I wanted to echo thanks back to luca semprini for her above code snippet which solved my woes for my DataGridView which was bound to a BindingSource. Before I found this blog, my WinForm was throwing "Operation is not valid.." errors if you tried to jump too much around my datagrid with a mouse cli...more >>

Thanks for your extensive answer. I think I am slowly grasping the concept of the LINQ-to-SQL object. Probably it is best not to force the concept to do what it is not intended to. I guess the problem is to get rid of old thinking from datasets and realize that this is something totally diff...more >>

I have an ObservableCollection of objects that encode a reference to an image with left, top, width, and height. I want to data bind them onto a Canvas in a WPF Window. What I've tried uses: <DataTemplate x:Key="ImageTemplate"> <Image Source="{Binding Path=Key, Converter={St...more >>

Thanks Marc for your answer. Your suggestion sounds very promising!!! I didn't find the Attach method before, but it might be the missing piece in my puzzle. When I read the documentation I found that a timestamp column was recommended so I added one to my table and then tried the following...more >>

You can always obtain the item you want (Dispose() and throw away the original context) - work with the object for a while (update properties etc); now when you want to save, create a new context and use Attach (on the relevant table) to tell this context about your snapshot object. Now Subm...more >>

Troll ...more >>

I tried the approach with a global singleton datacontext object. It works but I am a bit hesitant as I don't have full control as to what objects are actually submitted to database when I call SubmitChanges. A possible scenario is this: I have a form with Customers. For each customer there i...more >>

http://comp-languages.blogspot.com http://computer-language-tutorials.blogspot.com...more >>

Thanks for your extensive answer!! It did clarify the picture. I also read parts of the article but I still have one missing piece in my understanding. If I use LINQ-to-SQL and bind resulting entity classes/collections to my forms in controls like DataGridView, how should I send the updates...more >>

Hi Jakob, Thank you for your prompt response! > I thought LINQ could be used to map data all the way from database to GUI. In your example you use dataset as the foundation and just use LINQ to do some manipulation of the data. The feature of LINQ that you understand is called LINQ to S...more >>

The example I assumed is a detached data collection shown in a DataGridView. How can I get changes back to the database by using a LINQ-to-SQL layer?...more >>

I have no decided design yet, I am just trying to use LINQ the best way. I thought LINQ could be used to map data all the way from database to GUI. In your example you use dataset as the foundation and just use LINQ to do some manipulation of the data. Does this mean LINQ produced collections...more >>

To be fair, I will note that using a combination of a flag and checking to see if the underlying data element has REALLY changed actually reduces the problem to almost manageable levels. However, there is a remaining hangup. Specifically, if there is only one item in the List(Of myclass), it i...more >>

Did you notice that I said that ResetBindings causes multiple events to be raised? The point here is that if a single ResetBindings causes multiple, and not identical, numbers of events (1 this time, 3 the next, 4 the next, 1 the next), I have nothing to depend on to stop ignoring the events....more >>

Why not simply set a flag while you call ResetBindings()? Marc ...more >>

I'm assuming you mean LINQ-to-SQL, and that you aren't using a custom projection. Such objects are tracked by the DataContext; if you're context is still alive, you should just be able to call yourContext.SubmitChanges(); ? Marc ...more >>

Hi Jakob, Based on my understanding, in your application you load data from DB into a DataSet and use LINQ to do some query on top of this DataSet. Then you bind the result of the LINQ query through a BindingSource component to a DataGridView on the form. Your question is how to save update...more >>

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