uint appThread = GetCurrentThreadId();

AppDomain.GetCurrentThreadId is marked as deprecated in favour of Thread.ManagedThreadId but this will not to work with unmanaged API.

You can use the GetCurrentThreadId API as well:

     SetWindowsHookEx(HookType.WH_KEYBOARD, this.myCallbackDelegate, IntPtr.Zero, AppDomain.GetCurrentThreadId());

    SetWindowsHookEx(HookType.WH_KEYBOARD, Me.myCallbackDelegate, IntPtr.Zero, AppDomain.GetCurrentThreadId())

static extern uint GetCurrentThreadId();

Public Shared Function GetCurrentThreadId() As UInteger

  System.AppDomain.GetCurrentThreadId() (This is deprecated in .NET 2.0)

     threadId = (uint)AppDomain.GetCurrentThreadId();

static extern uint GetCurrentThreadId();

    info.ThreadId = GetCurrentThreadId();