System.IO.IsolatedStorage.IsolatedStorageFile.Close C# (CSharp) Method

        public void Close() { }
        public void CopyFile(string sourceFileName, string destinationFileName) { }

 public void DeleteClosedFile_ThrowsInvalidOperationException()
 {
     using (IsolatedStorageFile isf = IsolatedStorageFile.GetUserStoreForAssembly())
     {
         isf.Close();
         Assert.Throws <InvalidOperationException>(() => isf.DeleteFile("foo"));
     }
 }