سلام. 
در کد پایین دوتا تابع تعریف شده که یکیشون برای مپ کردنه و دیگری برای دیزکانکت.
Public Declare Function WNetAddConnection2 Lib "mpr.dll" Alias "WNetAddConnection2A" _
( ByRef lpNetResource As NETRESOURCE, ByVal lpPassword As String, _
ByVal lpUserName As String, ByVal dwFlags As Integer) As Integer
 
     Public Declare Function WNetCancelConnection2 Lib "mpr" Alias "WNetCancelConnection2A" _
(ByVal lpName As String, ByVal dwFlags As Integer, ByVal fForce As Integer) As Integer
 
        <StructLayout(LayoutKind.Sequential)> _
    Public Structure NETRESOURCE
            Public dwScope As Integer
            Public dwType As Integer
            Public dwDisplayType As Integer
            Public dwUsage As Integer
            Public lpLocalName As String
            Public lpRemoteName As String
            Public lpComment As String
            Public lpProvider As String
        End Structure
 
    Public Const ForceDisconnect As Integer = 1
    Public Const RESOURCETYPE_DISK As Long = &H1
 
    Public Function MapDrive(ByVal DriveLetter As String, ByVal UNCPath As String) As Boolean
 
            Dim nr As NETRESOURCE
            Dim strUsername As String
            Dim strPassword As String
 
            nr = New NETRESOURCE
            nr.lpRemoteName = UNCPath
            nr.lpLocalName = DriveLetter & ":"
            strUsername = Nothing '(add parameters to pass this if necessary)
            strPassword = Nothing '(add parameters to pass this if necessary)
            nr.dwType = RESOURCETYPE_DISK
 
            Dim result As Integer
            result = WNetAddConnection2(nr, strPassword, strUsername, 0)
 
            If result = 0 Then
                Return True
            Else
                Return False
            End If
        End Function
 
    Public Function UnMapDrive(ByVal DriveLetter As String) As Boolean
        Dim rc As Integer
            rc = WNetCancelConnection2(DriveLetter & ":", 0, ForceDisconnect)
 
               If rc = 0 Then
                Return True
            Else
                Return False
            End If
 
        End Function
 
 
البته یه راه حل دیگه هم هستش. 
شما می تونید از طریق command line هم یک دایرکتوری خالی ایجاد کنید، هم می تونید اون رو به اشتراک بگذارید و هم می تونید اونو map یا dkc کنید. من خودم این راه حل رو ترجیح می دم.