FileToString? StringToFile?

Question

hai... everyone who know how to convert the File to String? Actually, my idea is doing this to transfer the file to another computer. So, i convert the file (.text file or .exe file) to string and then send to another pc. After this, the pc will received this string then convert the string to File... So, i build up the protocol already but i dont know how to convert the file to string and the convert back from string to file.... anyone can help me..... thanks....