Hello
I try declare

Dim db as New BtDatabase()
and execute metod
db.open(par1,par2,par3)

but i get error :

System.NullReferenceException was unhandled
 Message="Object reference not set to an instance of an object."
 Source="Microsoft.VisualBasic"
 StackTrace:
      at
Microsoft.VisualBasic.CompilerServices.LateBinding.InternalLateCall(Object
o, Type objType, String name, Object[] args, String[] paramnames,
Boolean[] CopyBack, Boolean IgnoreReturn)
      at
Microsoft.VisualBasic.CompilerServices.NewLateBinding.LateCall(Object
Instance, Type Type, String MemberName, Object[] Arguments, String[]
ArgumentNames, Type[] TypeArguments, Boolean[] CopyBack, Boolean
IgnoreReturn)
      at ForteWB.WczytywanieWyciagu.WczytywanieWyciagu_Load(Object
sender, EventArgs e) in C:\Documents and Settings\Marcin\Moje dokumenty
\Visual Studio 2005\Projects\ForteWB\ForteWB
\WczytywanieWyciagu.vb:line 210
      at System.EventHandler.Invoke(Object sender, EventArgs e)
      at System.Windows.Forms.Form.OnLoad(EventArgs e)
      at System.Windows.Forms.Form.OnCreateControl()
      at System.Windows.Forms.Control.CreateControl(Boolean
fIgnoreVisible)
      at System.Windows.Forms.Control.CreateControl()
      at System.Windows.Forms.Control.WmShowWindow(Message& m)
      at System.Windows.Forms.Control.WndProc(Message& m)
      at System.Windows.Forms.ScrollableControl.WndProc(Message& m)
      at System.Windows.Forms.ContainerControl.WndProc(Message& m)
      at System.Windows.Forms.Form.WmShowWindow(Message& m)
      at System.Windows.Forms.Form.WndProc(Message& m)
      at
System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
      at
System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
      at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr
hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
      at
System.Windows.Forms.UnsafeNativeMethods.SendMessage(HandleRef hWnd,
Int32 msg, Int32 wParam, Int32 lParam)
      at System.Windows.Forms.Form.SetVisibleCore(Boolean value)
      at System.Windows.Forms.Control.set_Visible(Boolean value)
      at
System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32
reason, ApplicationContext context)
      at
System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32
reason, ApplicationContext context)
      at System.Windows.Forms.Application.Run(ApplicationContext
context)
      at
Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.OnRun()
      at
Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.DoApplicationModel()
      at
Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.Run(String[]
commandLine)
      at ForteWB.My.MyApplication.Main(String[] Args) in 17d14f5c-
a337-4978-8281-53493378c1071.vb:line 81
      at System.AppDomain.nExecuteAssembly(Assembly assembly,
String[] args)
      at System.Runtime.Hosting.ManifestRunner.Run(Boolean
checkAptModel)
      at System.Runtime.Hosting.ManifestRunner.ExecuteAsAssembly()
      at
System.Runtime.Hosting.ApplicationActivator.CreateInstance(ActivationContext
activationContext, String[] activationCustomData)
      at
System.Runtime.Hosting.ApplicationActivator.CreateInstance(ActivationContext
activationContext)
      at
Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssemblyDebugInZone()
      at System.Threading.ThreadHelper.ThreadStart_Context(Object
state)
      at System.Threading.ExecutionContext.Run(ExecutionContext
executionContext, ContextCallback callback, Object state)
      at System.Threading.ThreadHelper.ThreadStart()

Why i can't execute metod open on object db??

Marcin