Create a user on a remote machine using c#

Question

i am trying to create an app, which automatically creates and configures merge replication between the 2 PCs in the same local network.

To achieve this, i need to programaticaly create one user on each of the two PCs, this user should have exactly the same user name and passwords as it is required by the replication.

There is no DOMAIN on the network.

I did everything using GUI on both machines and replication works, now i need to do this using a C#. The replication part is done using SQL server 2012 RMO and SMO SDKs.

While googling, i found this (and many many other results which are more or less identical to this). But i believe, that these all examples are meant for local PCs, as it seems people were not getting errors like i do.

My sample code is:

DirectoryEntry directoryEntry = new DirectoryEntry(@"WinNT://WORKGROUP/WIN7-PC,computer", @"admin", "123456");
DirectoryEntry user = directoryEntry.Children.Add("RepTest", "user");
user.Invoke("SetPassword", new object[] { "rep123" });
user.CommitChanges();

I get an error at user.CommitChanges() saying that Access is denied, so i figured i had made a mistake in the authentication details provided to new DirectoryEntry(.... I fixed that and tried again:

DirectoryEntry directoryEntry = new DirectoryEntry(@"WinNT://WORKGROUP/WIN7-PC,computer", @"win7-pc\admin", "123456");
DirectoryEntry user = directoryEntry.Children.Add("RepTest", "user");
user.Invoke("SetPassword", new object[] { "rep123" });
user.CommitChanges();

Now I get the error on the line of .Children.Add(... stating that Multiple connections to a server or shared resource by the same user, using more than one user name, are not allowed.

When the first time i did it, i checked the Path of user object, which was WinNT://WORKGROUP/WIN7-PC/RepTest, not sure if it has anything to do with anything, but maybe it is trying to use the yet to be created new user folder while being connected as admin user?

Is there a way to get this thing going?