1.创建连接字符串

string con = "Data Source=127.0.0.1;Initial Catalog=dingdan;Integrated Security=True";

2.通过连接字符串生成连接对象

SqlConnection conn = new SqlConnection(con);

3.打开连接对象

conn.Open();

4.通过连接对象生成SQLCommand对象

SqlCommand cmd = conn.CreateCommand();

5.设置SqlCommand的sql语句

cmd.CommandText = "select * from goods";

6.执行sql语句，并用SqlDataReader读取结果

SqlDataReader reader = cmd.ExecuteReader();

7.新建DataTable对象

DataTable dt=new DataTable();

8.加载结果到表对象

dt.Load(reader);

至此就将所需结果加载到DataTable里面了