using System;
using System.Data;
using System.Data.SqlClient;
class Program
{
static void Main(string[] args)
{
string sqlConnectString = "Data Source=(local);Integrated security=SSPI;Initial Catalog=AdventureWorks;";
string sqlSelect = "SELECT TOP 5 * FROM Sales.SalesOrderDetail";
SqlDataAdapter da = new SqlDataAdapter(sqlSelect, sqlConnectString);
DataTable dt = new DataTable();
da.Fill(dt);
dt.Columns.Add(new DataColumn("ExtendedPrice", typeof(Decimal),"UnitPrice * (1 - UnitPriceDiscount) * OrderQty"));
foreach (DataRow row in dt.Rows)
Console.WriteLine(row["SalesOrderDetailID"]);
}
}