Use SqlDataAdapter to deal with the select statement : SqlDataAdapter : ADO.Net C# Examples

    
using  System;
using  System.Data;
using  System.Data.SqlClient;

class  MainClass
{
      static  void  Main(string[]  args)
      {
            string  connString  =  @"server  =  .\sqlexpress;integrated  security  =  true;database  =  northwind";

            string  sql  =  @"select  productname,unitprice  from  products  where  unitprice  <  20";

            SqlConnection  conn  =  new  SqlConnection(connString);

            try
            {
                  conn.Open();
                  SqlDataAdapter  da  =  new  SqlDataAdapter(sql,  conn);
                  DataSet  ds  =  new  DataSet();

                  da.Fill(ds,  "products");
                  DataTable  dt  =  ds.Tables["products"];
                  foreach  (DataRow  row  in  dt.Rows)  
                  {
                        foreach  (DataColumn  col  in  dt.Columns)
                              Console.WriteLine(row[col]);
                  }
            }
            catch(Exception  e)
            {
                  Console.WriteLine("Error:  "  +  e);
            }
            finally
            {
                  conn.Close();
            }
      }
}