https://learn.microsoft.com/fr-fr/dotnet/api/system.windows.forms.datagrid.hittestinfo?view=netframework-4.8.1&redirectedfrom=MSDN
DataGrid.HitTestInfo Class (System.Windows.Forms) | Microsoft Learn
Contains information about a part of the DataGrid at a specified coordinate. This class cannot be inherited.
class systemwindows formsdatagridmicrosoftlearn