Add an expression column to the table : DataColumn « ADO.Net « C# / CSharp Tutorial

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C# / CSharp Tutorial » ADO.Net » DataColumn 
32.37.6.Add an expression column to the table
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("ID = {0}, UnitPrice = {1}, " +
                    "Disc = {2}, Qty = {3}, Total = {4}",
                    row["SalesOrderDetailID"], row["UnitPrice"],
                    row["UnitPriceDiscount"], row["OrderQty"],
                    row["ExtendedPrice"]);
        }
    }
32.37.DataColumn
32.37.1.Use a relationship with a calculated column
32.37.2.Set auto increment, seed and step for primary key column
32.37.3.Output DataSet as Binary file
32.37.4.Find data by primary key, if not found add to database
32.37.5.Creating an Autoincrementing Primary Key
32.37.6.Add an expression column to the table
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