ขอถามเรื่องการแสดงข้อมูลตามช่วงเวลาหน่อยครับ ไม่ทราบว่าทำอย่างไร

bookStart = "2010-07-10";
bookEnd = "2010-07-12";
SELECT * FROM booking WHERE (OrdersDate BETWEEN '" & bookStart & " 'and '"& bookEnd &"') 

protected void buttonDate_Click(object sender, EventArgs e)
        {
            FilterDate(CalendarPopup1.SelectedDate,CalendarPopup2.SelectedDate);
        }

        private void FilterDate(DateTime ORDER_DATE1, DateTime ORDER_DATE2)
        {
            string connectionString = WebConfigurationManager.ConnectionStrings["NUTAILOR"].ConnectionString;
            SqlConnection sqlConnection = new SqlConnection(connectionString);

            try
            {
                
                
                sqlConnection.Open();
                SqlCommand sqlCmd = new SqlCommand();
                sqlCmd.Connection = sqlConnection;
                sqlCmd.CommandText = "select * from order  where ORDER_DATE between  and "; //ระหว่าง between  and ใส่ค่าที่รับจาก CalendarPopup ยังไงครับ
                

                SqlDataReader sqlDr = sqlCmd.ExecuteReader();
                gvProduct.DataSource = sqlDr;
                gvProduct.DataBind();

                sqlDr.Close();

protected void buttonDate_Click(object sender, EventArgs e)
        {
            FilterDate(CalendarPopup1.SelectedDate,CalendarPopup2.SelectedDate);
        }

        private void FilterDate(DateTime ORDER_DATE1, DateTime ORDER_DATE2)
        {
            string connectionString = WebConfigurationManager.ConnectionStrings["NUTAILOR"].ConnectionString;
            SqlConnection sqlConnection = new SqlConnection(connectionString);

            try
            {
                
                
                sqlConnection.Open();
                SqlCommand sqlCmd = new SqlCommand();
                sqlCmd.Connection = sqlConnection;
                sqlCmd.CommandText = "select * from order  where ORDER_DATE='2/9/2554' "; 
                

                SqlDataReader sqlDr = sqlCmd.ExecuteReader();
                gvProduct.DataSource = sqlDr;
                gvProduct.DataBind();

                sqlDr.Close();