System.unauthorizedaccessexception: 'access to the path 'D:\images.txt' is denied.' WPF C#

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)
           {
               string location = @"D:\images.txt";
               string path = System.IO.Path.Combine(location, picUserimage.Source + ".jpg");
               picUserimage.Source = new BitmapImage(new Uri(location));
           }

string text = @"file:\\\D:\images.png";
                       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));
                       }
                       txtActivationKey.Text = ds.Tables[0].Rows[0][12].ToString();
                       txtCreatedby.Text = ds.Tables[0].Rows[0][13].ToString();
                       txtDate.Text = ds.Tables[0].Rows[0][14].ToString();
                       conn.Close();