How to set default path for upload image and get image from datagrid to another form WPF C#

string text = @"file:\\\D:\\acer.jpg";
                        text = text.Replace(@"file:\\\", @"");
                        string userimagepath = AppDomain.CurrentDomain.BaseDirectory + text + ds.Tables[0].Rows[0][11].ToString();
                        if (!File.Exists(userimagepath))
                        {
                            picUserimage.Source = BitmapFromUri(new Uri(text));
                        }

openFileDialog1.CheckFileExists = true;
          openFileDialog1.CheckPathExists = true;
          openFileDialog1.DefaultExt = ".jpg";
          openFileDialog1.Filter = "jpg files (*.jpg)|*.jpg| PNG files (*.png)|*.png";
          openFileDialog1.FilterIndex = 2;
          openFileDialog1.RestoreDirectory = true;
          if (openFileDialog1.ShowDialog() == true)
          {

              picUserimage.Source = new BitmapImage(new Uri("D:\\acer.jpg"));
          }