https://learn.microsoft.com/tr-tr/dotnet/api/system.windows.forms.bindingsource.system-componentmodel-icanceladdnew-endnew?view=windowsdesktop-10.0
BindingSource.ICancelAddNew.EndNew(Int32) Method (System.Windows.Forms) | Microsoft Learn
Commits a pending new item to the collection.
windows formsmethodsystemmicrosoftlearn