When editing values in data-bound controls, users must navigate off the current record to commit the updated value to the underlying data source that the control is bound to. When you drag items from the Data Sources Window onto a form, the first item that you drop generates code into the save button click event of the BindingNavigator. This code calls the EndEdit method of the BindingSource. Therefore, the call to the EndEdit method is generated only for the first BindingSource that is added to the form.
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