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                                  • BeginUpdate doesn't work at all when datasource items get changed. Even though BeginUpdate is called the grid takes awfully lot of time to process changes.
                                    Steps to Reproduce:
                                    I have a situation like this. List<MyObject> is a DataSource. Each change to MyObject property raises OnPropertyChanged event.
                                    Now, even if I call BeginUpdate and then change some 100 properties of an object the grid is slooooow. Slow measured in seconds, like dog slow.
                                    So I went profiling the code and here is the culprit:
                                    IDataControllerValidationSupport.OnControllerItemChanged gets fired each time a property is modified and consumes awful lot of time.
                                    If I omit my internal call to OnPropertyChanged the grid becomes lightning fast.
                                    Actual Results:
                                    Dog slow.
                                    Expected Results:
                                    Fast as a bullet.

                                • Nick (DevExpress Support) 08.26.2007

                                  Hello Miha,
                                  The BeginUpdate method doesn't block data notifications. We will add BeginDataUpdate / EndDataUpdate methods similar to the XtraGrid. Thank you for drawing our attention to this issue.
                                  Thank you,

                                • Miha Markic - DevExpress MVP 08.26.2007
                                • Nick (DevExpress Support) 08.27.2007

                                  Thanks for your article. Your solution is good. I'd also call the OnDataManager_ListChanged method with the ListChangedType.Reset parameter from EndUpdate in the inherited class.
                                  Thank you,

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