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I am using databinding to bind List with my datagridview.
MyItem class contains checkbox element and displays correctly in datagridview.
But the selection behavior is odd. When I select the check box the same field in MyItem does not update.
When I change selected row(focus on checkedbox lost) the same field in corresponding instance of MyItem class is updated.
If I understand you correctly, what you are describing is the standard behaviour for all DataGridView cell types – the cell value changed event (and the databinding) occurs when focus leaves the cell.
As they say in the article I linked to, and as you allude to in your question, for a checkbox this behaviour is often not ideal. To work around this you can handle the
CurrentCellDirtyStateChangedand call the
CommitEditmethod. There is some discussion and example code here.