Determines whether the existing Silverlight plug-in matches or is compatible with a specified version string.
retval = silverlightObject.IsVersionSupported(versionString)
versionString
string
A string that represents the version to check against the Silverlight plug-in.
Type: Boolean
true if the existing Silverlight plug-in matches or is compatible with the specified version string; otherwise, false.
SilverlightHost..::.IsVersionSupported although note that you need an Application object and thus a running Silverlight application in order to call SilverlightHost..::.IsVersionSupported.
The versionString parameter contains four integer values that are separated by dots, following the format: major.minor.build.revision (for example, "1.0.50232.0"). The sequence of integers represent the following Silverlight version values:
The major version number.
The minor version number.
The build number.
The revision number.
This method primarily supports the JavaScript helper method IsInstalled, which is defined in Silverlight.js. The main reason you typically need to know the installed Silverlight version is to change the information that is displayed to the user before you instantiate a Silverlight plug-in instance with content on your HTML page, and to anticipate whether your users will see the Silverlight update or installation dialog box. When you have an instantiated Silverlight plug-in that is already displaying content, checking the installed version is of lesser importance.
Silverlight Plug-in