vs 连接sql，怎么也连不上，翻遍了网站，花了3个多小时才从网上找到原因  ，原来SqlConnection("Data Source=172.23.6x.xx;Initial Catalog=elementinfo;Persist Security Info=True;User ID=xx;Password=**");的格式不规范，搞成了SqlConnection conn = new SqlConnection("server=172.23.64.XX,uid=XX,Pwd=**,database=elementinfo");网上竟然很难找到准确的解决方案，害得我硬是盯着屏幕浪费了n分钟，n大于180啊！~~
不过还好，终于在1点半找到了答案。写来与菜鸟们共勉。
using System.Data.SqlClient;
 
 
SqlConnection conn = new SqlConnection("Data Source=172.23.6x.xx;Initial Catalog=elementinfo;Persist Security Info=True;User ID=xx;Password=**");
            String observertimes = "2009101423";
            String TableName = "tabCity";
            String term = " where observetimes='" + observertimes + "'";
            String sqlStr = "select * from " + TableName;
            SqlCommand catCMD = conn.CreateCommand();
            catCMD.CommandText = sqlStr;
            conn.Open();
            SqlDataReader myReader = catCMD.ExecuteReader();
            string aa = "";
            while (myReader.Read())
            {
                string ss = String.Format("{0}, {1}", myReader[0], myReader[1]);
                aa += ss;
            }
            myReader.Close();
   conn.Close();
            textBox1.Text = aa;