Gets a control object to which you can programmatically add child controls.
Assembly: System.Web.Extensions (in System.Web.Extensions.dll)
The UpdatePanel control without having to define a custom template that inherits from the ITemplate interface. If you are adding content to the UpdatePanel control declaratively or through a designer, you should add content to the ContentTemplate property by using a <ContentTemplate> element.property enables you to programmatically add child controls to the
Available since 3.5