Gets or sets the application-relative, virtual directory path to the file from which the control is parsed and compiled.
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When the file that defines a System.Web.UI.TemplateControl control resides in a directory other than that of the page processing the request, use the TemplateControl.AppRelativeVirtualPath property to return the application-relative, virtual path to the System.Web.UI.TemplateControl.
The Control.AppRelativeTemplateSourceDirectory property is set based on the virtual path that is set in the TemplateControl.AppRelativeVirtualPath property.