namespace WPFMuskTest
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        [DllImport
            ("myDll.DLL",
             EntryPoint = "?Func1@FUllNameCopiedFromDependancyWalker",
             CharSet = CharSet.Unicode, CallingConvention = CallingConvention.Cdecl
            )
        ]
        public static extern System.IntPtr Func1(out System.IntPtr handle, int type, out  DateTime date);

        public MainWindow()
        {
            InitializeComponent();
            //
            //
            //
        }

        private void button1_Click(object sender, RoutedEventArgs e)
        {
            System.IntPtr MainParam;
            int thetype = 1
            DateTime date;

            System.IntPtr res = GetFxIRMoveForDate(out MainParam, thetype _til, out date);
        }
    }
}

namespace1
{
namespace2
{
void func1(MyClass &myclass, const TYPE& type, const DATE_TYPE& date);
}
}