There is a question that needs to be solved first.
Q. How do multiple dropdownlists use a single datasource?
This question is not "showing the same data".
(call by value)
"Accessing only one data source address that shares data attributes, changed current values, etc."
(call by address)
If this question is resolved, you should move on to the next question.
The solution I want is this:
All dropdownlists exist in multiple rows in a grid.
If you selected data 0 in row 0, you should not be able to select data 0 in another row.
I've seen the example below, but it's not a way to disable the data I've selected, only to manually disable it.
What is the way?