C sharp - load de archivo xml en aplicación C#

private void button1_Click(object sender, System.EventArgs e)

        {

            Stream MyRuta = null;

            OpenFileDialog openFileDialog1 = new OpenFileDialog();

            openFileDialog1.InitialDirectory = "c:\\";

            openFileDialog1.Filter = "Xml files (*.xml)|*.mdb|All files (*.*)|*.*";

            openFileDialog1.FilterIndex = 2;

            openFileDialog1.RestoreDirectory = true;

            if (openFileDialog1.ShowDialog() == DialogResult.OK)

            {

                try

                {

                    if ((MyRuta = openFileDialog1.OpenFile()) != null)

                    {

                        using (MyRuta)

                        {

                            // Insert code to read the stream here.

                        }

                    }

                }

                catch (Exception ex)

                {

                    MessageBox.Show("Error: Could not read file from disk. Original error: " + ex.Message);

                }

            }

        }