Hello Monique,
To resolve the Namespace issue, please addTelerik.Web.UI in the using section:
using Telerik.Web.UI;
Also, if the radCheckedListBox1 is actually a RadListView, you can also use the RadListViewDataItem class which inherits the RadListViewItem.
foreach (RadListViewDataItem item in listview.Items)
{
}
Regards,
Peter Milchev
Progress Telerik
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