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Yes, immediately after u receive the result create another property in the and assign the sum of two columns to it and then assign it to the datagrids data provider. the property that you create will be mapped to the column which shows the sum. if you are using label function to get the sum you can se a lot of calls med to the label function even when you scroll, this is all unnecessary memory hog.
Thanks for your reply and help.
But what about if the user make changes in column01 and column02 after?
How can I reflect the calculations right away in the grid and also in the arraycollection?
Obviosly yu use item edit end to call the same method wrr the