reading a file using streamreader

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Mobile

Hye,
i am working in windows mobile 7
I have added a file "Book.txt" in my project.
and i want to read it using the code -

using (StreamReader reader = new StreamReader("Book.txt"))
            {
                string content = reader.ReadLine();
                string[] str = content.Split(",".ToCharArray());
                
                Book newB = new Book();

                newB.bookId = int.Parse(str[0]);
                newB.volumeId = int.Parse(str[1]);

                return newB
            }

but it gives error -

attempt to access the method failed system.io.streamreader..ctor system.string

at the line -

using (StreamReader reader = new StreamReader("Book.txt"))


what should i do now.....

thanks in advance....