Get Domain Name from ActiveDirectory in ASP.Net

Hello

I'm using this library from: https://github.com/Tulpep/Active-Directory-Object-Picker

cause its the same as original windows.

So i have issue with getting domain name/name of user when i select it from some group

Private Sub SelectUserOrGroup()
    Dim picker As New DirectoryObjectPickerDialog() With {
    .AllowedObjectTypes = ObjectTypes.Users Or ObjectTypes.Groups Or ObjectTypes.Computers,
    .DefaultObjectTypes = ObjectTypes.Computers,
    .AllowedLocations = Locations.All,
    .DefaultLocations = Locations.JoinedDomain,
    .MultiSelect = True,
    .ShowAdvancedView = True
}
    Using picker
        If picker.ShowDialog() = DialogResult.OK Then
 
            For Each sel In picker.SelectedObjects
                Dim aString As String = Replace(sel.Path, "WinNT://WORKGROUP/", String.Empty)
                Dim cString As String = Replace(aString, "/", "\")
                ComboBox1.Items.Add(cString)
                'MsgBox(sel.Path)
            Next
        End If
    End Using
End Sub

if i use it on local pc it will show result: DESKTOP-PTUJXLK\Usera

but when i put the program on my work pc and my network and i select one user from some other group it display it like this:

WinNT://Group/Group/User

any ideas how i can configurate it right in my code to get correct results without this WinNT:\\ message