thanks for your reply,
i have Database on server ,then the network fall down ,so i forced to work offline and i put Database on each client say client1 and client2
if i have the Table of Orders and the last OrderID=1000 before network fall down,
then,
client1 and client 2 work offline on each copy of database ,so the client1 enter the next OrderID=1001
and also client2 enter OrderID=1001
and i want to gather the all updates of Database .