Form1.cs

public partial class Form1 : Form
    {
        DataSet ds = new DataSet();
        DataTable table = new DataTable();
        //List<Pessoa> p = new List<Pessoa>();

        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            //Add Columns to DataTable (table)
            table.Columns.Add("Nome", typeof(string));
            table.Columns.Add("Idade", typeof(string));
            table.Columns.Add("Profissão", typeof(string));
            table.Columns.Add("Signo", typeof(string));
            table.Columns.Add("Morada", typeof(string));
            table.Columns.Add("Telemóvel", typeof(string));
            table.Columns.Add("Email", typeof(string));

            //ListView Properties
            listView1.View = View.Details;
            listView1.GridLines = true;
            listView1.FullRowSelect = true;


            //Add Columns to ListView
            listView1.Columns.Add("Nome", 100, HorizontalAlignment.Left);
            listView1.Columns.Add("Idade", 40, HorizontalAlignment.Left);
            listView1.Columns.Add("Profissão", 100, HorizontalAlignment.Left);
            listView1.Columns.Add("Signo", 80, HorizontalAlignment.Left);
            listView1.Columns.Add("Morada", 100, HorizontalAlignment.Left);
            listView1.Columns.Add("Telemóvel", 80, HorizontalAlignment.Left);
            listView1.Columns.Add("Email", 120, HorizontalAlignment.Left);

            //Array for Items
            string[] array = new string[8];
            ListViewItem lvitem;

            //Add Item1 to ListView
            array[0] = "Diogo Monteiro";
            array[1] = "21";
            array[2] = "C# Developer";
            array[3] = "Peixes";
            array[4] = "Rua da Paz";
            array[5] = "910852805";
            array[6] = "mdev@mateus.work";
            lvitem = new ListViewItem(array);
            listView1.Items.Add(lvitem);

            //Add Item2 to ListView
            array[0] = "Diogo Silva";
            array[1] = "24";
            array[2] = "Storage Developer";
            array[3] = "Carneiro";
            array[4] = "Rua da Costa";
            array[5] = "914568457";
            array[6] = "diogosilva@mateus.work";
            lvitem = new ListViewItem(array);
            listView1.Items.Add(lvitem);
        }


        private void newToolStripMenuItem_Click(object sender, EventArgs e)
        {
            AddPessoa MyForm = new AddPessoa();
            if (MyForm.ShowDialog() == System.Windows.Forms.DialogResult.OK)
            {

                Pessoa _c = MyForm._resultado;
                PessoaTable _ct = new PessoaTable();



                DataRow nr = ds.Tables[0].NewRow();
                nr["Nome"] = _c.nome;
                nr["Idade"] = _c.idade;
                nr["Profissao"] = _c.profissao;
                nr["Signo"] = _c.signo;
                nr["Morada"] = _c.morada;
                nr["Telemovel"] = _c.telemovel;
                nr["Email"] = _c.email;
                ds.Tables[0].Rows.Add(nr);

                XElement xmlNode = new XElement("Pessoa",
                new XElement("Nome", _c.nome),
                new XElement("Idade", _c.idade),
                new XElement("Profissao", _c.profissao),
                new XElement("Signo", _c.signo),
                new XElement("Morada", _c.morada),
                new XElement("Telemovel", _c.telemovel),
                new XElement("Email", _c.email));

                XElement xmlFile;
                try
                {
                    xmlFile = XElement.Load("diogomonteiro.xml");
                    xmlFile.Add(xmlNode);

                }
                catch (XmlException)
                {
                    xmlFile = new XElement("Pessoa", xmlNode);
                }
                xmlFile.Save("diogomonteiro.xml");
            }
        }

        private void closeToolStripMenuItem_Click(object sender, EventArgs e)
        {
            this.Close();
        }

        private void tsBtnDeleteAll_Click(object sender, EventArgs e)
        {
            listView1.Items.Clear();
        }

        private void tsBtnDeleteRow_Click(object sender, EventArgs e)
        {
            if (listView1.SelectedItems.Count == 0) return;
            listView1.SelectedItems[0].Remove();
        }

        private void tsBtnShowData_Click(object sender, EventArgs e)
        {
            //// Get the table from the data set
            //DataTable dtable = ds.Tables["Pessoa"];

            //// Clear the ListView control
            //listView1.Items.Clear();

            //// Display items in the ListView control
            //for (int i = 0; i < dtable.Rows.Count; i++)
            //{
            //    DataRow drow = dtable.Rows[i];

            //    // Only row that have not been deleted
            //    if (drow.RowState != DataRowState.Deleted)
            //    {
            //        // Define the list items
            //        ListViewItem lvitem = new ListViewItem(drow["Pessoa"].ToString());
            //        lvitem.SubItems.Add(drow["nome"].ToString());
            //        lvitem.SubItems.Add(drow["idade"].ToString());
            //        lvitem.SubItems.Add(drow["profissao"].ToString());
            //        lvitem.SubItems.Add(drow["signo"].ToString());
            //        lvitem.SubItems.Add(drow["morada"].ToString());
            //        lvitem.SubItems.Add(drow["telemovel"].ToString());
            //        lvitem.SubItems.Add(drow["email"].ToString());

            //        // Add the list items to the ListView
            //        listView1.Items.Add(lvitem);
            //    }
            //}
        }

        }
    }

object.cs

    public class PessoaListViewItem : ListViewItem
    {

        public override string ToString()
        {
            return Nome;
        }

        internal PessoaListViewItem(Pessoa _p)
            : base()
        {
            Nome = string.Empty;
            Idade = string.Empty;
            Profissao = string.Empty;
            Signo = string.Empty;
            Morada = string.Empty;
            Telemovel = string.Empty;
            Email = string.Empty;

            this.Text = _p.nome; //ListViewItem

            //Adicionar Sub-Items
            ListViewItem.ListViewSubItem _si1 = new ListViewItem.ListViewSubItem();
            _si1.Text = _p.idade;
            _si1.Text = _p.profissao;
            _si1.Text = _p.signo;
            _si1.Text = _p.morada;
            _si1.Text = _p.telemovel;
            _si1.Text = _p.email;

            this.SubItems.Add(_si1);
}

        private string _c { get; set; }
        public string Nome { get; set; }
        public string Idade { get; set; }
        public string Profissao { get; set; }
        public string Signo { get; set; }
        public string Morada { get; set; }
        public string Telemovel { get; set; }
        public string Email { get; set; }

        internal static void Equals()
        {
            throw new NotImplementedException();
        }
    }

    public class PessoaTable : DataTable
    {
        public PessoaTable()
        {
            Columns.Add(new DataColumn("Nome", typeof(string)));
            Columns.Add(new DataColumn("Idade", typeof(string)));
            Columns.Add(new DataColumn("Profissão", typeof(string)));
            Columns.Add(new DataColumn("Signo", typeof(string)));
            Columns.Add(new DataColumn("Morada", typeof(string)));
            Columns.Add(new DataColumn("Telemóvel", typeof(string)));
            Columns.Add(new DataColumn("Email", typeof(string)));
        }



    }


}

AddPessoa.cs

    public class PessoaListViewItem : ListViewItem
    {

        public override string ToString()
        {
            return Nome;
        }

        internal PessoaListViewItem(Pessoa _p)
            : base()
        {
            Nome = string.Empty;
            Idade = string.Empty;
            Profissao = string.Empty;
            Signo = string.Empty;
            Morada = string.Empty;
            Telemovel = string.Empty;
            Email = string.Empty;

            this.Text = _p.nome; //ListViewItem

            //Adicionar Sub-Items
            ListViewItem.ListViewSubItem _si1 = new ListViewItem.ListViewSubItem();
            _si1.Text = _p.idade;
            _si1.Text = _p.profissao;
            _si1.Text = _p.signo;
            _si1.Text = _p.morada;
            _si1.Text = _p.telemovel;
            _si1.Text = _p.email;

            this.SubItems.Add(_si1);
}

        private string _c { get; set; }
        public string Nome { get; set; }
        public string Idade { get; set; }
        public string Profissao { get; set; }
        public string Signo { get; set; }
        public string Morada { get; set; }
        public string Telemovel { get; set; }
        public string Email { get; set; }

        internal static void Equals()
        {
            throw new NotImplementedException();
        }
    }

    public class PessoaTable : DataTable
    {
        public PessoaTable()
        {
            Columns.Add(new DataColumn("Nome", typeof(string)));
            Columns.Add(new DataColumn("Idade", typeof(string)));
            Columns.Add(new DataColumn("Profissão", typeof(string)));
            Columns.Add(new DataColumn("Signo", typeof(string)));
            Columns.Add(new DataColumn("Morada", typeof(string)));
            Columns.Add(new DataColumn("Telemóvel", typeof(string)));
            Columns.Add(new DataColumn("Email", typeof(string)));
        }



    }


}

I have to Insert Object Type and Load Xml file in ListView, how ?

Check out XmlSerializer to see if it meets your needs. See this post for how to use it.

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