OBAppSrc/WpfApplicati.../ChooseRecord...

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Shapes;
using System.Data.Sql;
using System.Data.SqlClient;

namespace WpfApplication19
{
    /// <summary>
    /// Interaction logic for ChooseRecord.xaml
    /// </summary>
    public partial class ChooseRecord : Window
    {
        private SqlConnection _proConn;
        public ChooseRecord(string lotNo)
        {
            InitializeComponent();
            this.LotNo = lotNo;
            try
            {
                _proConn = Utils.createSqlConnection("productionDbCS");
            }
            catch (SqlException se)
            {
                MessageBox.Show("productionDbCS : ", se.Message);
            }
            SetupObject();
            //LotNoLabel.Content = LotNo;
        }
        private void SetupObject()
        {
            SqlDataReader reader = Utils.Query(_proConn, "select updated_at from data where lot_no = '"+this.LotNo+"' group by updated_at");
            while (reader.Read())
            {
                
                DateTimeCB.Items.Add(new ComboBoxItem() { Tag = "a", Content = reader["updated_at"].ToString() });
            }
            reader.Close();
            //DateTimeCB.ItemsSource = 
        }
        public string LotNo { get; set; }

        private void PreviewBtn_Click(object sender, RoutedEventArgs e)
        {
            Application.Current.MainWindow.Show();
            var w = (MainWindow)Application.Current.MainWindow;
            var s = ((ComboBoxItem)DateTimeCB.SelectedItem).Content.ToString();
            w.setFilterLogData(((ComboBoxItem)DateTimeCB.SelectedItem).Content.ToString());
            Close();
        }
    }
}