从SQL Server中的CSV文件保存数据

Question

我已经为数据库连接和数据库更新创建了类：

   class DatabaseConnection
   {
    private string sql_string;
    private string strCon;
    System.Data.SqlClient.SqlDataAdapter da;

    public string Sql { set { sql_string = value; } }
    public string connection_string { set { strCon = value; }}
    public System.Data.DataSet GetConnection{ get { return MyDataSet(); }}

    private System.Data.DataSet MyDataSet()
    {
        System.Data.SqlClient.SqlConnection con = new System.Data.SqlClient.SqlConnection(strCon);
        con.Open();
        da = new System.Data.SqlClient.SqlDataAdapter(sql_string, con);
        System.Data.DataSet dat_set = new System.Data.DataSet();
        da.Fill(dat_set, "Table_Data_1");
        con.Close();
        return dat_set;
    }

    public void UpdateDatabase(System.Data.DataSet ds)
    {
        System.Data.SqlClient.SqlCommandBuilder cb = new System.Data.SqlClient.SqlCommandBuilder(da);
        cb.DataAdapter.Update(ds.Tables[0]);
    }
}

一个程序

        try
        {
            objConnect = new DatabaseConnection();
            conString = Properties.Settings.Default.GBMRainfallConnectionString;
            objConnect.connection_string = conString;
            objConnect.Sql = Properties.Settings.Default.SQL;
            ds = objConnect.GetConnection;
            MaxRows = ds.Tables[0].Rows.Count;
            MessageBox.Show(MaxRows.ToString());
            //dRow = ds.Tables[0].Rows[100];
            //txtFirstName.Text = dRow.ItemArray.GetValue(0).ToString();
            //txtSurname.Text = dRow.ItemArray.GetValue(1).ToString();
        }
        catch (Exception err)
        {
            MessageBox.Show(err.Message);
        }

        string CatchID = @"C:\Users\NKB\Desktop\GBMCatchments.txt";
        List<string> CatchmentName = new List<string>();
        var catchmet = new StreamReader(File.OpenRead(CatchID));
        int x = 0;

        while (!catchmet.EndOfStream)
        {

            var line = catchmet.ReadLine();
            CatchmentName.Add(line);
            x = x + 1;
        }

        List<string> Date = new List<string>();
        List<string> CatchName = new List<string>();
        List<string> CatchRain = new List<string>();
        for (int j = 0; j < 360; j++)
        {

            string catchCSV = "C:\\Users\\NKB\\Desktop\\Catchments\\" + CatchmentName[j] + ".csv";

            var catchment = new StreamReader(File.OpenRead(catchCSV));

            while (!catchment.EndOfStream)
            {
                var line = catchment.ReadLine();
                var values = line.Split(',');
                Date.Add(values[0]);
                CatchName.Add(CatchmentName[j]);
                CatchRain.Add(values[1]);
            }
        }

        for (int i = 0; i < CatchRain.Count; i++)
        {
            DataRow row = ds.Tables[0].NewRow();
            row[0] = Date[i];
            row[1] = CatchName[i];
            row[2] = CatchRain[i];
            ds.Tables[0].Rows.Add(row);
        }
        objConnect.UpdateDatabase(ds);

数据保存在数据库中。但是当我关闭程序时，数据库不包含任何数据。它为什么会出现，解决方案是什么？