datacontext

I have a TreeListControl that binds to a collection in my VM. I also want to define the context menu inside the treelistcontrol having its header text bind to another string in my VM. how can I set the data context in this case? I tried to <Window.DataContext> <model:ViewModel></model:ViewModel> </Window.DataContext> <Grid> <Button Grid.Row="1" Command="{Binding CellCheckedCommand}"></Button> <TextBlock Text="{Binding HeaderText}" Grid.Row="2"> <TextBlock.ContextMenu> <ContextMenu> <MenuItem DataContext="{Binding RelativeSource={RelativeSource AncestorType={x:Type Window}}, Path=DataContext}"

I had a series of very bizarre errors being thrown in my repositories. Row not found or changed, 1 of 2 updates failed... Nothing made sense. It was as if my DataContext instance was being cached... Nothing made sense and I was considering a career move. I then noticed that the DataContext instance was passed in using dependency injection, using Ninject (this is the first time I have used DI...). I ripped out the Dependency Injection, and all went back to normal. Instantly. So dependency injection was the issue, but I still don't know why. I am speculating that Ninject was caching the injected

After a fair amount of research and some errors , I modified my code so that it creates a new DataContext each time the database is queried or data is inserted. And the database is queried frequently - for each of 250k transactions that are processed, the database is queried to obtain a customer id, department id, and category before the transaction is inserted. So now I'm trying to optimize the code as it was only processing around 15 transactions a second. I removed some extraneous queries and added some indexes and got it up to 30/sec. I then figured that even though everyone says a

In WPF Databinding, I understand that you have DataContext which tells an element what data it is going to bind to and ItemsSource which "does the binding". But e.g. in this simple example it doesn't seem that ItemsSource is doing anything useful since, what else would you want the Element to do to the DataContext except bind to it ? <ListBox DataContext="{StaticResource customers}" ItemsSource="{Binding}"> And in more complex examples of ItemsSource , you have Path and Source which seems to be encroaching on the territory of DataContext . ItemsSource="{Binding Path=TheImages, Source=

According to this post , I am using a data context per call, so in each method of my WCF service, I use a using block to create a new data context. But I have some doubts in the form to work in this way. For example, I use a method getAllCLients() from my repository to get all the clients of the data base, then the service send to the client that call the method a list with all the clients. Then the user modify the information of some of them, three for example. The modify client perhaps I can add to a list that have the modified clients. When I want to update this three clients, I can call a