Listview control exception

Hi everyone,

I hope someone can help me with this as I was unable to find anything on my own.

I have a C# very basic GUI application with 2 buttons and a listview control.

The listview control is being populated by a thread that is started from an external c++ dll I made myself. I pass the handle to the DLL function and I add items this way :

LVITEM lvItem;

lvItem.mask = LVIF_TEXT;
lvItem.iItem = 0;
lvItem.iSubItem = 0;
lvItem.pszText = "Just another entry";

lvItem.iItem = (int) SendMessage( hList, LVM_GETITEMCOUNT, 0, 0);
SendMessage( hList, LVM_INSERTITEM, 0, (LPARAM) &lvItem);

This works fine and the listview gets populated with no errors.
However if I give focus to the listview and maybe select different items or take the focus away I receive the following Exception :

************** Exception Text **************
System.ArgumentOutOfRangeException: InvalidArgument=Value of '2' is not valid for 'index'.
Parameter name: index
at System.Windows.Forms.ListView.ListViewItemCollection.get_Item(Int32 index)
at System.Windows.Forms.ListView.get_FocusedItem()
at System.Windows.Forms.ListView.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.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

************** Loaded Assemblies **************
mscorlib
Assembly Version: 2.0.0.0
Win32 Version: 2.0.50727.3053 (netfxsp.050727-3000)
CodeBase: file:///C:/Windows/Microsoft.NET/Framework/v2.0.50727/mscorlib.dll
----------------------------------------
HTTPLister
Assembly Version: 1.0.0.0
Win32 Version: 1.0.0.0
CodeBase: file:///D:/Code/HTTPLister/HTTPLister/bin/Release/HTTPLister.exe
----------------------------------------
System.Windows.Forms
Assembly Version: 2.0.0.0
Win32 Version: 2.0.50727.3053 (netfxsp.050727-3000)
CodeBase: file:///C:/Windows/assembly/GAC_MSIL/System.Windows.Forms/2.0.0.0__b77a5c561934e089/System.Windows.Forms.dll
----------------------------------------
System
Assembly Version: 2.0.0.0
Win32 Version: 2.0.50727.3053 (netfxsp.050727-3000)
CodeBase: file:///C:/Windows/assembly/GAC_MSIL/System/2.0.0.0__b77a5c561934e089/System.dll
----------------------------------------
System.Drawing
Assembly Version: 2.0.0.0
Win32 Version: 2.0.50727.3053 (netfxsp.050727-3000)
CodeBase: file:///C:/Windows/assembly/GAC_MSIL/System.Drawing/2.0.0.0__b03f5f7f11d50a3a/System.Drawing.dll

I do not have any code related to the the listview control on the C# side so I assume everything is handled by the default proc for the control.

I could really use some help with this.

Thanks in advance