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      How to: Automatically Create Grid Columns
      How to: Bind a Grid to Data (eXpress Persistent Objects)
      How to: Bind a Grid to an MS Access Database
      How to: Bind a Grid to an XML File
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      How to: Display Unbound Data
      How to: Create a Master-Detail Grid
      How to: Bind Card Headers to Data
      How to: Customize Automatically Generated Columns
      How to: Bind the Grid to Columns and Summaries Specified in ViewModel
      How to: Create a Banded View
      How to: Display Data Which is Being Updated on Another Thread
      How to: Use DXGrid in Server Mode with Entity Framework 4.0+
      How to: Activate the Instant Feedback Mode for the Grid Bound to the Entity Framework 4.0 Classes
      How to: Implement the Instant Feedback Mode (XPO)
      How to: Parallelize Data-Intensive Operations On In-Memory Data in Instant Feedback UI Mode
      How to: Speed Up Performance When Using WCF Data Services (OData) in Instant Feedback Mode
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 End-User Documentation
View this topic on docs.devexpress.com (Learn more)

How to: Display Data Which is Being Updated on Another Thread

Let's suppose that your data is being updated on another thread, by the timer in this example. You should take a special action to correctly reflect those changes in the grid - wrap them inside BeginDataUpdate/EndDataUpdate calls. When using the MVVM pattern, it is not possible to call grid's methods directly from the view model. Your view model can provide additional events to expose such changes of its state to the view. There are OnAsyncProcessingStarted and OnAsyncProcessingCompleted events in this example. Now you can handle these events in the view and force the grid to stop/start listening for data updates before/after asynchronous data modifications. Please note even though this approach requires several code lines in View's code-behind, ViewModel in this situation is completely independent from GridControl. Thus, this approach conforms the MVVM pattern.

UPDATED: After we introduced Services, the same task can be implemented by creating a custom service (How to create a Custom Service). This service will have access to the GridControl in the View, and will contain the required BeginUpdate and EndUpdate methods. In these methods, GridControl's BeginDataUpdate  and EndDataUpdate  methods will be called. Starting with v13.1.4, this example illustrates this approach.  

See also:

Services in ViewModelBase descendants

Services in POCO Objects  

Services in custom ViewModels

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