06 Apr 2021 08:33
RadCheckedDropDownList: ArgumentOutOfRangeException: "Index was out of range" when check new items from the list and rebind the control
I updated the code you sent to exhibit the behavior that we are seeing. Try changing the checked list box using the AutoSuggestMode. Press Save, see that the data disappears in the control, set a breakpoint in the same method, and see that the data Items are correct. Press Reset and see the data come back. And it may even give you the System.ArgumentOutOfRangeException: 'Index was out of range. Must be non-negative and less than the size of the collection.
Parameter name: index' exception when it tries to set the DataSource on line 39.
Let me know if you need more info.