[Solved] Image control does not loaded the tiff file,please find the solution.

private void RibbonButton_Click_1(object sender, RoutedEventArgs e)
       {
           Microsoft.Win32.OpenFileDialog dlg = new Microsoft.Win32.OpenFileDialog();
           dlg.InitialDirectory = @"c:\";
           dlg.Filter = "Image files (*.tif)|*.tif|All Files (*.*)|*.*";
           dlg.RestoreDirectory = true;
           bool? result = dlg.ShowDialog();
           if (dlg.ShowDialog == System.Windows.Forms.DialogResult.OK)
           {
               string selectedFileName = dlg.FileName;
               Label1.Content = selectedFileName;
               BitmapImage bitmap = new BitmapImage();
               bitmap.BeginInit();
               bitmap.UriSource = new Uri(selectedFileName);
               bitmap.EndInit();
               Imageviewer1.Source = bitmap;
           }