The way I would go about it is: Create an AcadSelectionSet of all the block inserts (AcadBlockReferences), you can filter the selection if you want to limit which inserts are selected. Then, load the names of the inserts into an array and assign the array to the List property of the ListBox, you can sort the array if you want. Finally, to delete the selected insert, just wire up the Click event of a button. Create a SelectionSet with the name of the insert selected on the ListBox and delete it. If you are not very familiar with all these steps then, do some homework on: Difference between AcadBlock and AcadBlockReference objects, creating SelectionSets and how to use filters and sorting arrays. There must be a lot of samples in this group. Good luck.
