All assemblies associated with an application use the same isolated store when using this method. This method can be used only when the application identity can be determined - for example, when the application is published through ClickOnce deployment or is a Silverlight-based application. If you attempt to use this method outside a ClickOnce or Silverlight-based application, you will receive an System.IO.IsolatedStorage.IsolatedStorageException exception, because the application identity of the caller cannot be determined.

IsolatedStorageFile.GetUserStoreForApplication is functionally equivalent to the following code:

code reference: System.IO.IsolatedStorage.IsolatedStorage#21

In this code, the applicationIdentity parameter for GetStore(IsolatedStorageScope scope, Object applicationIdentity) is null.