private void btnImport_Click(object sender, RoutedEventArgs e)
        {
            // tạo ra danh sách UserInfo rỗng để hứng dữ liệu.
            List<UserInfo> userList = new List<UserInfo>();
            try
            {
                var package = new ExcelPackage(new FileInfo("ImportData.xlsx"));

                ExcelWorksheet workSheet = package.Workbook.Worksheets[1];
                for (int i = workSheet.Dimension.Start.Row + 1; i <= workSheet.Dimension.End.Row; i++)
                {
                    try
                    {
                        int j = 1;

                        string name = workSheet.Cells[i, j++].Value.ToString();
                        int age = int.Parse(workSheet.Cells[i, j++].Value);
                        var birthdayTemp = workSheet.Cells[i, j++].Value;
                        DateTime birthday = new DateTime();
                        if (birthdayTemp != null)
                        {
                            birthday = (DateTime)birthdayTemp;
                        }
                        UserInfo user = new UserInfo()
                        {
                           Name = name,
                           Birthday = birthday
                        };
                        userList.Add(user);

                    }
                    catch (Exception exe)
                    {

                    }
                }
            }
            catch (Exception ee)
            {
                MessageBox.Show("Error!");
            }

            dtgExcel.ItemsSource = userList;
        }
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