Does IsolatedStorageFileStream.Lock work under SIlverlight4?

Posted by Noah on Stack Overflow See other posts from Stack Overflow or by Noah
Published on 2010-04-16T23:32:20Z Indexed on 2010/04/16 23:43 UTC
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Silverlight uses an IsolatedStorageFileStream to open files.

The IsolatedStorageFileStreamunder NET.4 claims to support the Lock Method (Inherited from FileStream)

The following code

IsolatedStorageFile isf;
IsolatedStorageFileStream lockStream = new IsolatedStorageFileStream( "my.lck", FileMode.OpenOrCreate, isf );
lockStream.Lock( 0, 0 );

generates the following error, wrapped for readability, under VS2010 and Silverlight 4

'System.IO.IsolatedStorage.IsolatedStorageFileStream' does not contain a definition for 'Lock' 
and no extension method 'Lock' accepting a first argument of type 'System.IO.IsolatedStorage.IsolatedStorageFileStream' could be found 
(are you missing a using directive or an assembly reference?)   

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