I had change my domain name and my CSCart was installed on my old domain name, how should i move to the new domain name without losing any database. please help 
I have just done the same thing.
Inform the CS helpdesk that you have changed domains, give them the old and the new name, they will swap the license for you (mine took about a day to do!), I have been told that you can then literally pick the old cart up and put it on the new server.
Whether thats true or not I don’t know for sure as I have installed the latest CS and carried out a fresh install.