Some gridview rows' buttons do not work, some does ASP.Net C#

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C#

ASP.NET2

I have a project that has a problem and I couldn't find the reason why. I use Ajaxcontrol GridView to display the data which come from the database.

Each row when populated has a DELETE and EDIT buttons. When DELETE is clicked, it should display a confirmation pop up. When EDIT is clicked, it will display ModalPopUpExtender for editing the data.

Some of the buttons in rows (like 1st 15 rows) work, but the buttons of rows below do not work. See pictures and codes in http://stackoverflow.com/q/29090333/3172200[^]

I couldnt insert images here