SqlDataReader使用

using System.Data.SqlClient;

namespace TestDB
{
    class Program
    {
        static void Main(string[] args)
        {
            string strConn = @"  server = (local);   
                                 integrated security = true;  
                                 database = Northwind ";
          
            string strSQL = "select UnitPrice, UnitsInStock from Products";

            SqlConnection cn = new SqlConnection(strConn);
            SqlDataReader sqlRder = null;
            try
            {
                cn.Open();
                SqlCommand cmd = new SqlCommand(strSQL, cn);

                sqlRder = cmd.ExecuteReader();
                //把结果域放到aData数组中
                object[] aData = new object[sqlRder.FieldCount];
                while (sqlRder.Read())
                {
                    //一次读出一行数据，并保存在aData中
                    sqlRder.GetValues(aData);
                    for (int i = 0; i < aData.Length; ++i)
                    {
                        ////逐个读出每列值.
                        System.Console.Write("{0}, ", aData[i].ToString());
                    }
                        
                    System.Console.WriteLine("\n----------------------------------");
                }

            }
            catch (System.Exception exp)
            {
                System.Console.WriteLine(exp.ToString());
            }
            finally
            {
                if (!sqlRder.IsClosed)
                    sqlRder.Close();
                cn.Close();
            }
        }
    }
}