By default, the summaries are refreshed only when you leave the current row to another row because the edited values are not saved in the underlying DataSource when the CurrentCell is edited and navigated in the same row itself. The summary value is calculated only when the changes are made in the DataSource.
Way 1: By using Built-in property:
There is a property in the TableDescriptor.Fields collection called the ForceImmediateSaveValue. By setting this property value to true, the changes made in the CurrentCell is immediately saved into the underlying DataSource while leaving the CurrentCell to the same row itself. Therefore, the summaries are updated automatically.
Way 2: By using Work Around
By using the CurrentRecordContextChange event handler, you can also update the summary values by invalidating the summary when the value of the current record is changed.
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