You can use PInvoke to access this function from VB.NET using the following
signature

Declare Function GetNamedSecurityInfo Lib "advapi32.dll" ( _
   ByVal pObjectName As String, _
   ByVal ObjectType As SE_OBJECT_TYPE, _
   ByVal SecurityInfo As SECURITY_INFORMATION, _
   ByRef pSidOwner As IntPtr, _
   ByRef pSidGroup As IntPtr, _
   ByRef pDacl As IntPtr, _
   ByRef pSacl As IntPtr, _
   ByRef pSecurityDescriptor As IntPtr) As Integer

Do visit this page
http://www.pinvoke.net/default.aspx/advapi32.GetNamedSecurityInfo it has
some sample code for the use of this and other API functions.

--
HTH

Kaushik Srenevasan
Microsoft Student Ambassador,
Madurai .NET student user group
http://groups.msn.com/MaduraiDotNet