how can i generate xml key in c#

Question

hello everyone,

i create desktop application in c#.net.

I want to create xml file and encrypt it, and also decrypt and need random key.

I create xml file in which i pass companyname, no of user,no of compnay .

now that data create in xml file. 

now i want to xml key and use that key as prodcut key for install the exe setup. 

now i want to xml key how can it get i dont know. How can i generate xml key???

so help me.