In this article, I will show you how to use AJAX PopupControlExtender to build a multiple select DropDownList as this: Firstly, we need an image captured from a standard drop down list as this: I will use this image as the drop down list instead of the built-in ASP:DropDownList control, the reason is that when a drop down list is clicked, its own selections will be displayed and will overlap with the check box […]
ASP.NET DropDownList Multiple Select
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