Hi,

What I'm trying to do is populate a set of values in a combobox based on the items checked in a checked list box. In the setup of my form I set the combobox.DataSource = checkedlistbox.CheckedItems property. This works well and populates the combobox with what is currently ticked.

The problem then comes with updates, the list doesn't update when the list of checked items changes. The only way I've been able to force it to relist them so far is by setting the DataSource to nothing and then back again, this of course does more than simply refreshing the list and I figure there has to be a better way.

Does anyone have any ideas ?

Many thanks in advance,

Neil.

Hi

The reason why the ComboBox doesn’t update the data source automatically is that the CheckedItemCollection class doesn’t implement the IBindingList interface, which has a ListChanged event to notify the ComboBox to update the data source if the underlying list get changed. If you want to update the ComboBox’s data source automatically when the list of checked items changes, you can custom a CheckedListBox like the following:

Hope this helps.
Best regards.
Rong-Chun Zhang

Hi

The reason why the ComboBox doesn’t update the data source automatically is that the CheckedItemCollection class doesn’t implement the IBindingList interface, which has a ListChanged event to notify the ComboBox to update the data source if the underlying list get changed. If you want to update the ComboBox’s data source automatically when the list of checked items changes, you can custom a CheckedListBox like the following:

Hope this helps.
Best regards.
Rong-Chun Zhang

Hi,

That worked a treat.

Many thanks,

Neil.