API calls in VB .NET

[Penavin]

Hi!

When using API calls in .NET like in VB 6 I can't obtain the same result. Actually, there are no results at all!
What is the problem?

Here are functions I tryed to use:

Private Declare Function RegOpenKeyEx Lib "advapi32" Alias "RegOpenKeyExA" _
     (ByVal hKey As Long, _
      ByVal lpSubKey As String, _
      ByVal ulOptions As Long, _
      ByVal samDesired As Long, _
      ByRef phkResult As Long) As Long

Private Declare Function RegQueryValueEx Lib "advapi32" Alias "RegQueryValueExA" _
     (ByVal hKey As Long, _
      ByVal lpValueName As String, _
      ByVal lpReserved As Long, _
      ByRef lpType As Long, _
      ByVal lpData As String, _
      ByRef lpcbData As Long) As Long

Private Declare Function RegCloseKey Lib "advapi32" _
     (ByVal hKey As Long) As Long

Thank you.