[DllImport("kernel32.dll")]
 static extern bool WritePrivateProfileString(string lpAppName,
   string lpKeyName, string lpString, string lpFileName);

<DllImport("kernel32.dll", SetLastError:=True)> _
 Private Shared Function WritePrivateProfileString(ByVal lpAppName As String, _
                                                ByVal lpKeyName As String, _
                                                ByVal lpString As String, _
                                                ByVal lpFileName As String) As _
                                                Boolean
    End Function