https://learn.microsoft.com/ru-ru/dotnet/api/system.windows.forms.datagridview.rowvalidated?view=netframework-4.8.1&viewFallbackFrom=windowsdesktop-9.0
DataGridView.RowValidated Event (System.Windows.Forms) | Microsoft Learn
Occurs after a row has finished validating.
event systemwindows formsdatagridviewmicrosoftlearn