When set, the TargetURL is displayed in the frame specified by the TargetFrame property.
The TargetURL should be a fully qualified Uniform Resource Locator, for example, "http://www.infragistics.com". If the URL lacks a protocol specifier (i.e., http://) it will be treated as a relative address (for example, the filename of another web page in the same directory as the current web application).
Additionally, developers may use this property to make a script call by prefixing a language specifier recognized by the end user's browser. An example of calling a JavaScript function named myFunction would look like this:
TargetURL="javascript:myFunction()";
Target Platforms: Windows 10, Windows 8.1, Windows 8, Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2