How to speed up Word Interop processing?
<p>I am Very new at C# and have written a fairly clunky code. I have been doing a lot of courses online and a lot say that there are several ways to approach problems. Now i have made a program that will Load up a .Doc Word file and then search for the relevant information using if statements. </p>

<p>Now my problem with my solution is that this program takes FOREVER!!! I am talking about 30Mins - 1Hour to complete the following code.</p>

<p>Any ideas of how to make my little program a little less clunky? I hope that solutions to this will increase my knowledge substantially so thanks in advance everyone!</p>

<p>regards
chris</p>

<pre><code>using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace WindowsFormsApplication3
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        public int id = 0;
        public int[] iD = new int[100];
        public string[] timeOn = new string[100];
        public string[] timeOff = new string[100];
        public string[] dutyNo = new string[100];
        public string[] day = new string[100];

        private void button1_Click(object sender, EventArgs e)
        {



            Microsoft.Office.Interop.Word.Application application = new Microsoft.Office.Interop.Word.Application();
            Microsoft.Office.Interop.Word.Document document = application.Documents.Open("c:\\Users\\Alien\\Desktop\\TESTJOBS.doc");
            //the following for will loop for all words

            int count = document.Words.Count;
            for (int i = 1; i &lt;= count; i++)
            {
                // the following if statement will look for the first word that is On
                // this is then (on the file) proceded by  04:00 (thus i+2/3/4 respectively)
                if (document.Words[i].Text == "On")
                {
                    iD[id] = id;
                   // Console.WriteLine("ID Number ={0}", iD[id]);
                    dutyNo[id] = document.Words[i - 14].Text;
                   // Console.WriteLine("duty No set to:{0}", dutyNo[id]);
                    timeOn[id] = document.Words[i + 2].Text + document.Words[i + 3].Text + document.Words[i + 4].Text;
                   // Console.WriteLine("on time set to:{0}", timeOn[id]);
                    // the following if (runs if the last word was not "On" and then searches for the word "Off" which procedes "On" in the file format)
                    // this is then (on the file) proceded by  04:00 (thus i+2/3/4 respectively)
                }
                else if (document.Words[i].Text == "Off")
                {
                    timeOff[id] = document.Words[i + 2].Text + document.Words[i + 3].Text + document.Words[i + 4].Text;
                    //Console.WriteLine("off time set to:{0}", timeOff[id]);
                    // the following if (runs if the last word was not "Off" and then searches for the word "Duty" which procedes "Off" in the file format)
                    // this is then (on the file) proceded by  04:00 (thus i+2/3/4 respectively)
                }
                else if (document.Words[i].Text == "Days" &amp;&amp; !(document.Words[i + 3].Text == "Type"))
                {

                    day[id] = document.Words[i + 2].Text;
                    //Console.WriteLine("day set to:{0}", day[id]);
                    //we then print the whole new duty out to ListBox1
                    listBox1.Items.Add(string.Format("new duty ID:{0} Time on:{1} Time off:{2} Duty No:{3} Day:{4}", iD[id], timeOn[id], timeOff[id], dutyNo[id], day[id]));
                    id++;
                }


            }

            for (int i = 1; i &lt;= 99; i++)
            {
                Console.WriteLine("new duty ID:{0} Time on:{1} Time off:{2} Duty No:{3} Day:{4}", iD[id], timeOn[id], timeOff[id], dutyNo[id], day[id]);
            }


        }
    }
}
</code></pre>