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(); }