using System; 
  using System.Collections.Generic; 
  using System.ComponentModel; 
  using System.Data; 
  using System.Drawing; 
  using System.Text; 
  using System.Windows.Forms; 
  using System.IO;  
   
  namespace WindowsApplication1 
  { 
      public partial class Form1 : Form 
      { 
          public Form1() 
          { 
              InitializeComponent(); 
          } 
   
          private void button1_Click(object sender, EventArgs e) 
          { 
              string[] metin; 
              decimal hn; 
              decimal sn; 
              string writeThisis; 
              string yazi; 
              StreamReader oku; 
              //----------------------------------------------------------------------------- 
     oku = File.OpenText("dosya1.txt"); 
              while ((yazi = oku.ReadLine()) != null) 
              { 
                  metin = Paket(yazi).Split(';'); 
                  hn = Convert.ToDecimal(metin[1]) + Convert.ToDecimal(metin[2]); 
                  sn = Convert.ToDecimal(metin[3]) + Convert.ToDecimal(metin[4]); 
                  writeThisis = "" + (hn * sn); 
                  yazici(writeThisis); 
              } 
          } 
          public void yazici(string yzT) 
          { 
              StreamWriter SW = File.AppendText("dosya2.txt"); 
              SW.WriteLine(yzT); 
              SW.Close(); 
          } 
          private static string Paket(string dizi) 
          { 
              string eko = ""; 
              string yz = edit(dizi.ToString()); 
              string[] Paket = yz.Split(); 
              for (int i = 0; i < Paket.Length; i++) 
              { 
                  if (Paket[i] != "") 
                  { 
                      eko += Paket[i] + ";"; 
                  } 
              } 
              return eko; 
          } 
          private static string edit(string datam) 
          { 
              string oks; 
              oks = datam.ToString(); 
   
              return oks; 
          } 
      } 
  }