I have a question on my project(alias Book Shelf) that within it i have created a class in which i am sending some books details(like author,title etc) to the stream through the file object (referenced to the Storage file BookDetails.txt placed in my computer) when i am sending the data to the file it is writing on it null against Author , null against title and 0.0 against  Edition (here all these 3 are variables and edition is of type double rest are string)