private void but_search_Click(object sender, EventArgs e)
        {
            string search;

            if (IsNullsearch())
            {
                LoadPhieuNhap();
            }
            else
            {
                while (true)
                {
                    if (comboBox_loc.Text == "")
                    {
                        if (funcShare.isNumber(textbox_search.Text))
                        {
                            string or       = " OR ";
                            string searchID = "phieu_nhap.id= " + textbox_search.Text;
                            string ngay     = "DAY(ngay_nhap) = " + textbox_search.Text;
                            string thang    = "MONTH(ngay_nhap) = " + textbox_search.Text;
                            search = query + " and (" + searchID + or + ngay + or + thang + ")";
                        }
                        else
                        {
                            if (funcShare.isDate(textbox_search.Text) == true)
                            {
                                string[] arr = textbox_search.Text.Split('/', '-');

                                search = query + " and ngay_nhap =" + funcShare.date(arr[0], arr[1], arr[2]);
                            }
                            else
                            {
                                string tenNCC = "nha_cung_cap.ten LIKE N'%" + textbox_search.Text + "%'";
                                string tenNV  = "nhan_vien.ten LIKE N'%" + textbox_search.Text + "%'";
                                search = query + " and (" + tenNCC + " or " + tenNV + ")";
                            }
                        }
                        database.pushGridview(search, gridView);
                        break;
                    }
                    if (comboBox_loc.Text == "Mã phiếu nhập hàng" && funcShare.isNumber(textbox_search.Text))
                    {
                        search = query + " and phieu_nhap.id=" + textbox_search.Text;

                        database.pushGridview(search, gridView);
                        break;
                    }  //v
                    if (comboBox_loc.Text == "Nhà cung cấp")
                    {
                        if (funcShare.isNumber(textbox_search.Text))
                        {
                            search = query + " and ncc_id=" + textbox_search.Text;
                        }
                        else
                        {
                            string like = "nha_cung_cap.ten LIKE N'%" + textbox_search.Text + "%'";
                            search = query + " and " + like;
                        }
                        database.pushGridview(search, gridView);
                        break;
                    }  //v
                    if (comboBox_loc.Text == "Ngày nhập")
                    {
                        if (funcShare.isNumber(textbox_search.Text))
                        {
                            if (textbox_search.Text.Length <= 2)
                            {
                                search = query + " and (DAY(ngay_nhap)=" + textbox_search.Text + " or MONTH(ngay_nhap)=" + textbox_search.Text + ")";
                            }
                            else
                            {
                                search = query + " and YEAR(ngay_nhap)=" + textbox_search.Text;
                            }
                            database.pushGridview(search, gridView);
                        }
                        else
                        {
                            if (funcShare.isDate(textbox_search.Text) == true)
                            {
                                string[] arr = textbox_search.Text.Split('/', '-');
                                search = query + " and ngay_nhap =" + funcShare.date(arr[0], arr[1], arr[2]);
                                database.pushGridview(search, gridView);
                            }
                        }

                        break;
                    }    //v
                    if (comboBox_loc.Text == "Nhân viên")
                    {
                        if (funcShare.isNumber(textbox_search.Text))
                        {
                            search = query + " and nhan_vien_id=" + textbox_search.Text;
                        }
                        else
                        {
                            string like = "nhan_vien.ten LIKE N'%" + textbox_search.Text + "%'";
                            search = query + " and " + like;
                        }
                        database.pushGridview(search, gridView);
                        break;
                    }  //v
                    if (comboBox_loc.Text == "Mặt hàng")
                    {
                        if (funcShare.isNumber(textbox_search.Text))
                        {
                            search = "SELECT distinct phieu_nhap.id,nha_cung_cap.ten,ngay_nhap,nhan_vien.ten FROM " +
                                     "phieu_nhap,nha_cung_cap,nhan_vien,chi_tiet_phieu_nhap " +
                                     "where ncc_id=nha_cung_cap.id and nhan_vien_id=nhan_vien.id " +
                                     "and phieu_nhap.id = phieu_nhap_id and mat_hang_id =" + textbox_search.Text;
                        }
                        else
                        {
                            search = "SELECT distinct phieu_nhap.id,nha_cung_cap.ten,ngay_nhap,nhan_vien.ten FROM " +
                                     "phieu_nhap,nha_cung_cap,nhan_vien,chi_tiet_phieu_nhap,mat_hang " +
                                     "where ncc_id=nha_cung_cap.id and nhan_vien_id=nhan_vien.id " +
                                     "and phieu_nhap.id = phieu_nhap_id and mat_hang_id = mat_hang.id and mat_hang.ten LIKE N'%" + textbox_search.Text + "%';";
                        }
                        database.pushGridview(search, gridView);
                        break;
                    }   //v
                    break;
                }
            }
        }
        private void but_search_Click(object sender, EventArgs e)
        {
            string search;


            if (funcShare.isNumber(textbox_search.Text))
            {
                if (comboBox_loc.Text == "")
                {
                    string or        = " OR ";
                    string searchID  = "id= " + textbox_search.Text;
                    string searchncc = "ncc_id= " + textbox_search.Text;
                    string searchnv  = "nhan_vien_id= " + textbox_search.Text;
                    search = query + " where " + searchID + or + searchncc + or + searchnv;
                    database.pushGridview(search, gridView);
                }
                if (comboBox_loc.Text == "Mã đơn hàng")
                {
                    search = query + " WHERE id=" + textbox_search.Text;

                    database.pushGridview(search, gridView);
                }
                if (comboBox_loc.Text == "Mã nhà cung cấp")
                {
                    search = query + " WHERE ncc_id=" + textbox_search.Text;
                    database.pushGridview(search, gridView);
                }
                if (comboBox_loc.Text == "Mã nhân viên")
                {
                    search = query + " WHERE nhan_vien_id=" + textbox_search.Text;
                    database.pushGridview(search, gridView);
                }
                if (comboBox_loc.Text == "Mã mặt hàng")
                {
                    search = "SELECT distinct phieu_nhap.id,phieu_nhap.ncc_id,ngay_nhap,nhan_vien_id FROM phieu_nhap " +
                             "inner join chi_tiet_phieu_nhap on phieu_nhap.id = phieu_nhap_id WHERE mat_hang_id =" + textbox_search.Text;
                    database.pushGridview(search, gridView);
                }
            }
            else
            {
                if (comboBox_loc.Text == "" && funcShare.isDate(textbox_search.Text) == true)
                {
                    string date = "ngay_nhap = '" + textbox_search.Text + "'";
                    search = query + " where " + date;
                    database.pushGridview(search, gridView);
                }
                if (textbox_search.Text == "Tìm kiếm")
                {
                    funcShare.loadGridView("phieu_nhap,nha_cung_cap,nhan_vien where ncc_id=nha_cung_cap.id and nhan_vien_id=nhan_vien.id"
                                           , "phieu_nhap.id,nha_cung_cap.ten,ngay_nhap,nhan_vien.ten", gridView);
                }
                if (comboBox_loc.Text == "Tên mặt hàng")
                {
                    search = " SELECT distinct phieu_nhap.id,phieu_nhap.ncc_id,ngay_nhap,nhan_vien_id " +
                             "FROM phieu_nhap,chi_tiet_phieu_nhap,mat_hang" +
                             " where phieu_nhap.id = phieu_nhap_id and mat_hang_id = mat_hang.id " +
                             "and mat_hang.ten LIKE N'%" + textbox_search.Text + "%';";
                    database.pushGridview(search, gridView);
                }
                if (comboBox_loc.Text == "Ngày nhập")
                {
                    if (funcShare.isDate(textbox_search.Text) == true)
                    {
                        search = query + " WHERE ngay_nhap ='" + textbox_search.Text + "'";
                        database.pushGridview(search, gridView);
                    }
                }
            }
        }