Displaying in DataGridView

Question

hi, my question is about the datagridview. I create a class ctsContacts with this source code:

 

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace TestingListe
{
    class ctsContacts:lstContacts
    {
        private int _numero;

        public int Numero
        {
            get { return _numero; }
            set { _numero = value; }
        }

        private string _nom;

        public string Nom
        {
            get { return _nom; }
            set { _nom = value; }
        }
        private string _prenom;

        public string Prenom
        {
            get { return _prenom; }
            set { _prenom = value; }
        }
        private string _message;

        public string Message
        {
            get { return _message; }
            set { _message = value; }
        }


        public ctsContacts()
        {

        }

        public ctsContacts(int numero, string nom,string prenom,string message)
        {
            this.Numero = numero;
            this.Nom = nom;
            this.Prenom = prenom;
            this.Message = message;
        }

        public bool recherche(int num)
        {
            foreach (ctsContacts search in ct)
            {
                if (search.Numero == num)
                {
                    return false;
                }

            }
            return true;

        }

        public bool Ajouter(ctsContacts ctn)
        {
            if (this.recherche(ctn.Numero) == true)
            {
                ct.Add(ctn);
                return true;
            }
            return false;
        }

    }
}

 This class inherits another abstract class that contains a list

 

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace TestingListe
{
    class lstContacts
    {
        public static List<ctsContacts> ct = new List<ctsContacts>();
        public lstContacts()
        {

        }

    }
}

and then in the contact form and add button at this writing source code

 

private void btnajouter_Click(object sender, EventArgs e)
        {
            ctsContacts contact = new ctsContacts();
            contact.Numero = int.Parse(txtnumero.Text);
            contact.Nom = txtNom.Text;
            contact.Prenom = txtPrenom.Text;
            contact.Message = txtmesssage.Text;

            contact.Ajouter(contact);

            dgvcontacts.DataSource = null;

            dgvcontacts.DataSource = ctsContacts.ct;

        }

 the problem is at the datagridview display that copy header right.

 

 

and bellow i upload all the project in a .rar file