Wpf combobox selectedindex not updating

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tracked Customers = New Data Service Collection(Of Customer)(customer Query) ' Load all pages of the response at once. Data service client classes that are generated when you use the Add Service Reference dialog box or the Data Svc tool implement this interface.

If you provide your own client data classes, you must use another type of collection for data binding.

For more information, see Loading Deferred Content. Private Function On My Collection Changed( _ By Val entity Collection Changedinfo As Entity Collection Changed Params) As Boolean If entity Collection Changedinfo. Remove Then ' Delete the related items when an order is deleted. Private Function On My Collection Changed( _ By Val entity Collection Changedinfo As Entity Collection Changed Params) As Boolean If entity Collection Changedinfo. Remove Then ' Delete the related items when an order is deleted. Target Entity, Orders) ' Load the related Order Details. Load Property(deleted Order, "Order_Details") ' Delete the order and its related items For Each item As Order_Details In deleted Order. Delete Link(deleted Order, "Order_Details", item) context. Delete Object(item) Next ' Delete the order and then return false since the object is already deleted. Delete Object(deleted Order) Return False Else Return True End If Else ' Use the default behavior.

In this case, you must explicitly load pages by calling the Load method on the Data Service Collection ' Create a new collection for binding based on the LINQ query. Return True End If End Function , the objects themselves must implement the INotify Property Changed interface.

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When the data service is paging response data, each response contains a link that is used to return the next page of results. You can modify the data binding events to override the default behavior, which includes the following constraints: ' Method that is called when the Collection Changed event is handled. Get Type() Is Get Type(Order) Then ' Get the context and object from the supplied parameter. Context Dim deleted Order As Order = _ CType(entity Collection Changedinfo. Return False End If End Function ' Method that is called when the Collection Changed event is handled. Get Type() Is Get Type(Orders) Then ' Get the context and object from the supplied parameter. Context Dim deleted Order As Orders = _ CType(entity Collection Changedinfo.This method uses the Sql Data Adapter to populate a Data Set.The table ‘Orders’ in the Data Set is then bound to the Binding Source component which gives us the flexibility to choose/modify the data location.Data Grid View control is a Windows Forms control that gives you the ability to customize and edit tabular data.In this short snippet, we will populate a Data Grid View using the Load Data() method.A common requirement is to calculate the total of a currency field and display it in a textbox.

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