A C# code for database replication between two remote machines

Thanks for asking question, but there are very few details about the task on which you are working, I suppose from "Replication" you mean "Replication Management Objects (RMO)"

RMO allows programmatic control of Replication via the Microsoft.SqlServer.Replication namespace.

Have a look at Replication Management Object Concepts to get started.

Keep in mind that RMO is deprecated and may be removed in a future release of SQL Server.

Also, please see How to: Synchronize a Push Subscription (RMO Programming) and How to: Synchronize a Pull Subscription (RMO Programming) for instructions on how to synchronize a Merge subscription programmatically using Replication Management Objects in C#.

You can also take a look at http://www.nullskull.com/a/10474998/sql-server-replication-using-c.aspx

Thanks.