SelectPicker in UpdatePanel disappear when Asyncpostback

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It's my first question, I'm sorry for my bad English skill.

I have problem about <select class="form-control selectpicker"</select> in UpdatePanel, it disappears when I clicked on a button (button's in a UpdatePanel too)

Here's my aspx code

=========================================================================

========================================================================= Clicked On a button so my <select> is disappear T_T

=========================================================================

It's all my code.

How do I do?

2 Answers
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