Short answer, it is possible to, “hide data inside a text file without changing the fle size even by a single byte and without replacing/changing/distorting any of the readable/printable letters of the file”. But the characters would not be readable at that time the “hidden” data is in there. Of course you need a mask data stream to extract the “hidden” data from the real/actual (what ever you want to call it) data. The question here is why??? :confused: If you want to encrypt/hide the data then use a real encryption algorithm. It would be far more secure then simple hide and seek protocol.

You could backup the database on your development server and restore it to your production server. Alternatively, generate scripts for your database from Management Studio, copy and run them on your production server. Paul Marfleet "No, his mind is not for rent To any God or government" Tom Sawyer - Rush

Nelek wrote: good luck by self learning I think it was a good answer. Sometimes I want to ask this question but I forgot,did your problem solve ?I think you have a problem on your project? WhiteSky