private void CheckBoxNam_CheckedChanged(object sender, EventArgs e) { if (checkBoxNam.Checked == true) { checkBoxNu.Checked = false; checkBoxKhac.Checked = false; dtgioitinh = dbNhanVien.LayNVtheoGT("Nam"); dvgNV.DataSource = dtgioitinh; LoadKhiCheck(); } else { LoadData(); } }