Change GridView's “Checked Out” column from a button to a label based on whether cardNumber is null or not?

You can create another control label and sets its visibity to false. You have already defied command argument for the button. Give a command name too .

In the browseMethod, which will be called for every row in the grid, when the grid is getting populated. So you can make the button enabled or disabled based on the condition..

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