Can i write in to field of system matrix??

can i write in to field of system matrix??

Yes, that is possible, but only using the UI (not the datasource) and only if the field is visible and editable (if a user could write to it so could you)...
A small sample on how to do it (C#):
((EditText)oMatrix.Columns.Item("coluid").Cells.Item(<rowNumber>).Specific).Value = "my value"
Be aware though... Updating data this way can be quite slow...

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