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How to use %username% variable in Active Directory user paths using C#?

I developed an Active Directory user management tool in C# that does some things automatically. This is better for my particular case than the "Active Directory Users and Computers" tool from Microsoft. I have to use roaming profiles and home directories which contain the username of a user.
Now I want to change the username of a user with my program in C#. Everything works fine, but I want to use the "%username%" variable instead of putting the new username directly into these paths (home directory and roaming profile), because, by using the variable, I ensure that the new username will be placed into these paths if I copy the user object using Microsoft's AD management tool (right click --> "copy").
If I enter "%username%" when creating or editing a user with Microsoft's AD tool, this variable gets replaced by the username, so it works. But if I put this variable into a path using C#, it just puts the string "%username%" at the end of the path (e.g. "\fileserver1\UserHomes\%username%"). It doesn't replace it with the actual username and "stores" that placeholder.
How can I use this variable within my C# code properly, so that it get's replaced with the actual username?
I'm using this code (reduced, it's just an example) to change the users username (SamAccountName) and, for example, the home directory. "user" is my UserPrincipal object. Of course, I'm renaming the actual folder after this:
[...]
string newUsername = "NewUsername"; // New username
user.SamAccountName = newUsername;
user.UserPrincipalName = $"{ newUsername }#{ domain }";
user.HomeDirectory = "\\fileserver1\UserHomes\%username%";
user.Save(); // Save changes

The %username% environment variable and the one used AD Users and Computers is not the same. AD Users and Computers replaces it with the actual username value immediately when you click OK. It is not something that AD understands, just a token used by the AD Users and Computers application.
Considering you already constructed a string using the username, you shouldn't find it hard to fix this.
user.HomeDirectory = $"\\fileserver1\UserHomes\{newUsername}";
Also powershell would probably be more appropriate for something like this.

see Renaming a User Account Does Not Automatically Change the Profile Path

Get domain UserName for computer that not in domain

I hope somebody could help me to solve my problem.
There is some domain, and some shared directory in that domain. User has domain username and password, to get access to that shared directory, but his computer is not in domain most of time. I mean, when he need to connect to that directory he is typing network path (for example "\\fileserver"), than windows asks for username and password, and after writing it he will get the access until restart windows or logout.
So my question is, how can i get domain user name that user uses to connect to network, by using C# code?
I tryed to use CredentialCache.GetCredential, but i think it works only if user connect to shared directory by using NetworkCredentials in C# program. If connection already was before C# program started, it will be empty.
I also tryed Environment.UserName, but since computer is not in domain, it returns only local user name, that different from domain username.
Sorry for my bad english, i hope you could understand my explanation.

Have you took a look at the nugget package CredentialManagement ?
I used it already, but couldn't roam credential saved with enterprise persistence
using CredentialManagement;
using (CredentialSet credentials = new CredentialSet())
{
Debug.Print(credentials.Count.ToString() + " credential(s) found.");
foreach (Credential credential in credentials)
{
Debug.Print(credential.Target); //This is domain/IP of the saved credential.
Debug.Print(credential.Type.ToString());
Debug.Print(credential.Username);
Debug.Print(credential.PersistanceType.ToString());
Debug.Print(credential.Description);
Debug.Print(credential.LastWriteTime.ToString());
}
Debug.Print("End");
}

Authentication issue with C# connection to mysql

So I have an application that is trying to use Command.ExecuteScalar, which works perfectly well on a connection with "root" credentials or with my own user credentials, but I have set up another user in workbench called "AgentsHighPriv" and with that it fails.
The connectionstring is the same except for the substitution with the alternative username and password. However this username and password connects in MySql Workbench, what am I overlooking here.
The specific error message is:
{"Authentication to host 'xxxx' for user 'AgentsHighPriv' using method 'mysql_native_password' failed with message: Access denied for user 'AgentsHighPriv'#'%' to database 'rbac'"}
Well it seems there is a difference between credentials that I had not grasped. The privileges had some differences; "schema privalges" were the same as for my own user privileges but, the New User did not require admin privileges of any kind, so I did not use the tab and set global privileges. However if on the administrative roles tab I actually select one of the global privalages, - it then authenticates. At least to say it did so when I tested with select, show view, alter, and drop
Yet I have these same privalages set on the Schema Privalages tab!
So this will make it work now but I dont understand the logic - if anybody could explain I would be happy to hear.
Thanks

How to get the computer name of a person

Is it possible to get the computer name for a person that is found through Active Directory?
I am currently getting the person via DirectorySearcher object, and from there can get the user's SID, but i don't know where to look next in order to find the actual computer name that is assigned to that SID or person?
Or maybe there is an easier way to get this information from Active Directory?

There is no association of computers to users in default AD - so there is no way to get such information.
You may find last/currently logged on set of machines for a user (also I don't think this is available in AD, see How to find what user last logged onto a given computer through Active Directory in C#? for some starting points) or maybe you add custom information that gives that association in AD (Retrieving custom Active Directory properties of users).

Get current windows user first name when the app is executed through network

I have an app (C#, .NET4.5) placed on a remote computer, accessed and executed via local network. Let's call the computer where the app is placed "AppPC" and the computer that is exeuting the app "UserPC".
I want to achieve the same I would get with this, which is the first name (not username) of the current Windows User:
System.DirectoryServices.AccountManagement.UserPrincipal.Current.DisplayName;
This code works just fine when the app is located on the same UserPC, but it throws an exception if the app is located on AppPC. More precisely is a System.DirectoryServices.Protocols.LdapException: "Can't establish connection. "
I can find the name of UserPC using this:
PrincipalContext ctx = new PrincipalContext(ContextType.Machine,null);
string pcName = ctx.ConnectedServer;
But from there, I do not know how to get the current user name.
I have tried getting all the UserPrincipal in ctx through a loop over a PrincipalSearcher.FindAll() but this only shows two users "Administrator" and "Guest" which is false, at least on UserPC. Maybe AppPC has that users, I'm not sure.
With System.Environment.UserName I can get the username but not the first name, which is what I'm interested in.
EDIT: Forgot to say that I have already checked this and doesn't work also (null):
How do I get the current username in .NET using C#?