private void btnXoaDU_Click(object sender, EventArgs e) { try { using (var k = new AppCode.QuanCafe()) { foreach (DataGridViewRow row in grvDSDoUong.Rows) { DataGridViewCheckBoxCell chk = (DataGridViewCheckBoxCell)row.Cells[0]; if (chk.Value != ckbChonDoUong.TrueValue) { k.XoaDoUong(int.Parse(grvDSDoUong.Rows[row.Index].Cells[1].Value.ToString().Trim())); } } LoadDSDoUong(); } } catch { return; } }