I already wrote in the Visual Studio Group about my problem
I wrote as suggested in the Microsoft Community
So now i try it here
I wrote an Application with Visual Studio 2017, that has a Datagridview with a combobox, because in an mdi form the combobox didn't select the wanted linked entry, it only displays the first entry.
There are two tables that are linked by the referenced id and i show one table, but need entries from the second to show them in the combobo and it should show the entry that is linked from the first table.
As it doesn't work with the integrated Comboboy, i needed another solution and used an ObservableCollection to get it working (see sample project for more Details. which i can not attach apparently)
After the last patch day this doesn't work any more.
I tested the application also with Visual studio 2022, which has the same result.
When you have two entries with the same displayed name, it chooses always the first entry(withe same name) and not the selected.
This worked for some years now perfectly, as there is no way i can change it programmatically, the changes have to be made by an Windpows update, or a fix for the mdi problem with Datagridview and combobox.
The problem occurred on all Computer from multiple Customers, so it seems to be a problem with an automatic windows update
If you need more information, i am happy to provide it