I Want To Help To Transform The Code Tag Linked Database To Calculate The Exponential Smoothing Forecasting In C# , Because I New In C# Please

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;



namespace First
{
    class Program
    {
        static void Main(string[] args)
        {

            int  pre_forcast;
            int  pre_period;
             douple a = 0.4 ;
            Console.WriteLine("what is Previous Forecast ? :");


            pre_forcast = System.Convert.ToInt32(Console.ReadLine());


            Console.WriteLine("what is  Previous Period’s Actual Demand ? :");


            pre_period = System.Convert.ToInt32(Console.ReadLine());

            int New_Forecast = (int) (pre_forcast + a * (pre_period - pre_forcast ));

            Console.WriteLine("The New Forecast : ",  New_Forecast );
            Console.ReadLine();

        }
    }
}