如何以中文方式显示星期几

//方法1
        private void btnQuery_DayOfWeek_Click(object sender, EventArgs e)
        {
            MessageBox.Show("今天是："+"日一二三四五六".Substring((int)DateTime.Now.DayOfWeek,1);
        }

//方法2
        //必须添加 using System.Collections
        private void btnQuery_DayOfWeek_Click(object sender, EventArgs e)
        {
            Hashtable htb = new Hashtable();
            htb.Add("Monday","星期一");
            htb.Add("Tuesday", "星期二");
            htb.Add("Wednesday", "星期三");
            htb.Add("Thursday", "星期四");
            htb.Add("Friday", "星期五");
            htb.Add("Saturday", "星期六");
            htb.Add("Sunday", "星期日");
            string str = htb[DateTime.Now.DayOfWeek.ToString().Trim()].ToString();
            MessageBox.Show("今天是：" + str);
        }