https://learn.microsoft.com/de-de/dotnet/api/system.windows.forms.datagridview.userdeletingrow?view=netframework-4.8.1&viewFallbackFrom=windowsdesktop-10.0
DataGridView.UserDeletingRow Event (System.Windows.Forms) | Microsoft Learn
Occurs when the user deletes a row from the DataGridView control.
event systemwindows formsdatagridviewmicrosoftlearn