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

        public bool DirectoryExists(string path) { throw null; }
        public void Dispose() { }

 private static void VerifyFolderExistsAsync(IsolatedStorageFile isolatedStorageFile)
 {
     if (!isolatedStorageFile.DirectoryExists(MonthFolder))
     {
         isolatedStorageFile.CreateDirectory(MonthFolder);
     }
 }