xml class

[poqeqw]

I need a problem in an application im writing: In my app there is a class User [serializable] Class User { public string _name; public int _id; } i create an instance of this class in memory. I haev a file in my file system that the the xml represemnatation of this class has to be the header of the file (without changing the original file) how can i combine the xml user class and the file in the most correct and eficiant manner - combinig them in memory to a stram or byte array. How can i do taht in teh most correct and eficiant manner? Sample code will be great Thanks