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Sample Download : http://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.  

imageYou can find more code samples that demonstrate the most typical programming scenarios by using Microsoft All-In-One Code Framework Sample Browser or Sample Browser Visual Studio extension. They give you the flexibility to search samples, download samples on demand, manage the downloaded samples in a centralized place, and automatically be notified about sample updates. If it is the first time that you hear about Microsoft All-In-One Code Framework, please watch the introduction video on Microsoft Showcase, or read the introduction on our homepage http://1code.codeplex.com/.