DataGridView コントロールの DataGridView.VirtualMode プロパティが true であり、セルの値が変更して、元のデータソースのストレージを必要とするときに発生します。

Message in Japanese (日本語)

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Occurs when the DataGridView.VirtualMode property of the DataGridView control is true, and a cell value has changed and requires storage in the underlying data source.

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