private void Dgvpr_RowHeaderMouseDoubleClick(object sender, DataGridViewCellMouseEventArgs e)
        {
            Btndelete.Visible = true;
            Btnupdate.Visible = true;

            int idperson = Convert.ToInt32(Dgvpr.Rows[e.RowIndex].Cells[0].Value);

            selectedperson = _context.person_infos.Find(idperson);
            Txtn.Text      = selectedperson.Name;
            Txts.Text      = selectedperson.Surname;
            Txte.Text      = selectedperson.Email;
            Txtp.Text      = selectedperson.Phone;
        }
        private void Btnadd_Click(object sender, EventArgs e)
        {
            person_infos pr = new person_infos
            {
                Name    = Txtname.Text,
                Surname = Txtsur.Text,
                Email   = Txtml.Text,
                Phone   = Txtph.Text
            };

            this._context.person_infos.Add(pr);
            this._context.SaveChanges();
            MessageBox.Show("Info Added", MessageBoxButtons.OK.ToString());
        }