Error in DialogResult in WPF 2010

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WPF

Hi ,

I am trying to upload a image from the local drive to the visual studio 2010(WPF).

I got an error message stating System.Nullable<bool> does not contain a defition for 'OK' and no extension method 'OK' accepting a first argument of type System.Nullable<bool>could be found (are you missing a using directive or an assembly reference?)

Please find the code :

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;

using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using System.Windows.Forms;


 namespace Image_Upload
 {
       /// <summary>
      /// Interaction logic for MainWindow.xaml
     /// </summary>
     public partial class MainWindow : Window
      {
         public MainWindow()
         {
             InitializeComponent();
             ImageViewer1.Source = new BitmapImage(new Uri("creek.jpg",       UriKind.Relative));
        }

        private void Browse_ButtonClick(object sender, RoutedEventArgs e)
          {
           
            Microsoft.Win32.OpenFileDialog dlg = new Microsoft.Win32.OpenFileDialog();
            dlg.InitialDirectory = "c:\\";
            dlg.Filter = "Image files (*.jpg)|*.jpg|All Files (*.*)|*.*";
            dlg.RestoreDirectory = true;
          
            
            if(dlg.ShowDialog() == DialogResult.OK)     
            {   
                string selectedFileName = dlg.FileName;
                FileNameLabel.Content = selectedFileName;
                BitmapImage bitmap = new BitmapImage();
                bitmap.BeginInit();
                bitmap.UriSource = new Uri(selectedFileName);
                bitmap.EndInit();
                ImageViewer1.Source = bitmap;
            }
        }

Please suggest me .

Thanks in advance.