Cannot have multiple items selected in a DropDownList

Jun 26, 2009 at 3:54 PM
Edited Jun 26, 2009 at 3:55 PM

I was getting this error after I created a Parent column, then click back to edit the column properties. To fix it I had to modify the source code and before every call to FindByValue or FindByText I had to call ClearSelection. That fixed the issue for me. See a blog post about this here: