Drop down calendar control

How is the asp.net calendar control displayed in a popup window and how is the selected date displayed inside a Textbox contr开发者_如何学运维ol?

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The Ajax Control Toolkit calendar is good:

http://www.asp.net/ajax/ajaxcontroltoolkit/Samples/Calendar/Calendar.aspx

Also, there is a JQuery UI one which is nice:

http://jqueryui.com/demos/