[Sample Of Oct. 29] Add new DropDownList option

Oct.

29

Sample : https://code.msdn.microsoft.com//Add-new-DropDownList-option-d114683b

This project uses three popular methods to display a popup message for asking user whether or not to add a new item to a DropDownList. They all happen at client side, and do not postback. They are javascript's native confirm() function, AJAX control toolkit's ModalPopupExtender, and jQuery UI's Dialog.

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