private void btnDelete_Click(object sender, EventArgs e)
 {
     if (dgvAddressBook.RowCount != 0)
     {
         DialogResult dr = MessageBox.Show("Are you sure", "Delete", MessageBoxButtons.YesNo);
         if (dr == DialogResult.No)
         {
             return;
         }
         if (dr == DialogResult.Yes)
         {
             int AddressId = (int)(dgvAddressBook.SelectedRows[0].Cells[0].Value);
             AddressBO.DeleteInAddress(AddressId);
         }
     }
     dgvAddressBook.DataSource = AddressBO.GetAddress();
 }