6. Tạo lớp Utilities

- Nội dung file ControlFormat.cs

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Windows.Forms;

using System.Drawing;

namespace BookShop.Utilities

{

    class ControlFormat

    {

        public static void DataGridViewFormat(DataGridView dgv,string[] columns)

        {

            foreach(DataGridViewColumn cl in dgv.Columns)

            {

                if (!columns.Contains(cl.Name))

                    cl.Visible = false;       

            }

        }

        public static int ToIntPrice(string price)

        {

            string s = price.Replace(",", "");

            return int.Parse(s);

        }

        public static string ToFormatPrice(int price)

        {

            string s = price.ToString("0,0");

            return s;

        }

    }

}