private void TinhLuong_Load(object sender, EventArgs e)
        {
            //Lay ra danh sach nam
            ChamCongXL ChamCong = new ChamCongXL();
            DataTable  dt_Nam   = ChamCong.LayRaNam();

            //Them vao combobox Nam
            for (int i = 0; i < dt_Nam.Rows.Count; i++)
            {
                cb_Nam.Items.Add(dt_Nam.Rows[i][0].ToString());
            }
            cb_Nam.SelectedIndex = 0;
        }
        private void cb_Nam_SelectedIndexChanged(object sender, EventArgs e)
        {
            string Nam = cb_Nam.Text;
            //Lay ra danh sach thang
            ChamCongXL ChamCong = new ChamCongXL();
            DataTable  dt_Thang = ChamCong.LayRaThang(Nam);

            for (int i = 0; i < dt_Thang.Rows.Count; i++)
            {
                cb_Thang.Items.Add(dt_Thang.Rows[i][0].ToString());
            }
            cb_Thang.SelectedIndex = 0;
        }
        private void bt_Tim_Click(object sender, EventArgs e)
        {
            //Clear GirdView
            if (grid_Luong.Rows.Count > 1)
            {
                int k = grid_Luong.Rows.Count;
                for (int i = 0; i < k; i++)
                {
                    grid_Luong.Rows.RemoveAt(0);
                    i = 0;
                    k--;
                }
            }
            //Tim nhan vien ung voi ten nhap vao
            NhanVienXL NhanVien      = new NhanVienXL();
            DataTable  DT_DSNhanVien = NhanVien.TraCuuNhanVien("", txt_Ten.Text);
            //Lay ve thang, nam
            int Thang = Convert.ToInt16(cb_Thang.Text);
            int Nam   = Convert.ToInt16(cb_Nam.Text);

            //
            for (int i = 0; i < DT_DSNhanVien.Rows.Count; i++)
            {
                //Lay ra ma nhan vien
                string MaNV = DT_DSNhanVien.Rows[i][0].ToString();
                //Lay ra bang cham cong ung voi nhan vien nay
                ChamCongXL ChamCong = new ChamCongXL();
                DataTable  dt       = ChamCong.LayRaChamCongThanhVien(MaNV, Thang, Nam);
                if (dt.Rows.Count > 0)
                {
                    //Them thong tin vao grid view
                    DataGridViewRow  row = new DataGridViewRow();
                    DataGridViewCell col = new DataGridViewTextBoxCell();
                    //Cot Ten Nhan Vien
                    col.Value = DT_DSNhanVien.Rows[i][1].ToString();
                    row.Cells.Add(col);
                    //Cot So Ngay Nghir
                    col       = new DataGridViewTextBoxCell();
                    col.Value = dt.Rows[0][4].ToString();
                    row.Cells.Add(col);
                    //Cot So Ngay Di Tre
                    col       = new DataGridViewTextBoxCell();
                    col.Value = dt.Rows[0][5].ToString();
                    row.Cells.Add(col);
                    //Cot luong co ban
                    //Lay ra ma loai nhan vien ung voi ma nhan vien
                    string MaLoaiNV = NhanVien.TimMaLoaiNV(MaNV);
                    //Lay ra Luong co ban
                    LoaiNhanVienXL LoaiNV   = new LoaiNhanVienXL();
                    DataTable      dt_Luong = LoaiNV.LayThongTinLoaiNV(MaLoaiNV);
                    //
                    col       = new DataGridViewTextBoxCell();
                    col.Value = dt_Luong.Rows[0][2].ToString();
                    row.Cells.Add(col);
                    //Cot tong luong
                    //Lay ra tham so
                    ThamSoXL  ThamSo    = new ThamSoXL();
                    DataTable dt_ThamSo = ThamSo.LayThamSo();
                    //Tinh luong
                    double TongLuong = Convert.ToDouble(dt_Luong.Rows[0][2].ToString()) - Convert.ToDouble(dt.Rows[0][4].ToString()) * Convert.ToDouble(dt_ThamSo.Rows[0][4].ToString()) - Convert.ToDouble(dt.Rows[0][5].ToString()) * Convert.ToDouble(dt_ThamSo.Rows[0][5].ToString());
                    col       = new DataGridViewTextBoxCell();
                    col.Value = TongLuong.ToString();
                    row.Cells.Add(col);

                    grid_Luong.Rows.Add(row);
                }
            }
        }