Main form

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 Блокнот
{
    public partial class fMain : Form
    {
        public int firstCharacter;
        public int secondCharacter;
        public int startIndex;
        public int lenghtText;
        public int i = -1;
        int[] first = new int[100000];
        public fMain()
        {
            InitializeComponent();
        }
        private void tsmiExit_Click(object sender, EventArgs e)
        {
            SaveTextPad();
            this.Close();
        }
        private void tsmiAbout_Click(object sender, EventArgs e)
        {
            MessageBox.Show("Программа: Блокнот. \nАвтор: Королев Дмитрий Сергеевич. \nСтудия: Lona Games", "О программе");
        }
        private void tsmiClear_Click(object sender, EventArgs e)
        {
            rtbTextPad.Clear();
            Textt.allText = rtbTextPad.Text;
        }
        private void tsmiLoad_Click(object sender, EventArgs e)
        {
            LoadTextPad();
        }
        private void tsmiSave_Click(object sender, EventArgs e)
        {
            SaveTextPad();
        }
        private void tsmiInsertDateAndTime_Click(object sender, EventArgs e)
        {
            rtbTextPad.AppendText("\n" + DateTime.Now + "\n");
        }
        private void tsmiInsertTime_Click(object sender, EventArgs e)
        {
            rtbTextPad.AppendText("\n" + DateTime.Now.ToShortTimeString() + "\n");
        }
        void LoadTextPad()
        {
            try
            {
                Textt.ReadParam();
            }
            catch
            {
                MessageBox.Show("Ошибка при загрузке.");
            }
            finally
            {
                rtbTextPad.Text = Textt.allText;
            }
        }
        void SaveTextPad()
        {
            try
            {
                Textt.WriteParam();
            }
            catch
            {
                MessageBox.Show("Ошибка при сохранении.");
            }
        }
        public void Search()
        {
            lenghtText = Textt.findText.Length;
            if (lenghtText > 1)
            {
                while (firstCharacter != -1)
                {
                    i++;
                    if (i > -1)
                    {
                        first[i] = firstCharacter;
                        Textt.first[i] = first[i];
                        System.Console.WriteLine("mass{0}", first[i]);
                    }
                    firstCharacter = Textt.allText.IndexOf(Textt.findText, startIndex);
                    secondCharacter = (firstCharacter + lenghtText) - 1;
                    startIndex = secondCharacter;
                    Textt.allCount = i;
                    System.Console.WriteLine("first {0}, second {1}, lenght {2}, start {3}" , firstCharacter, secondCharacter, lenghtText, startIndex);
                }
                if (firstCharacter == -1)
                {
                    return;
                }
            }
            else if (lenghtText <= 1)
            {
                Textt.allCount = 0;
            }
        }
        private void tsmiSearchWindow_Click(object sender, EventArgs e)
        {
            fSearch form2 = new fSearch(this);
            form2.Show();
        }
        private void fMain_FormClosed(object sender, FormClosedEventArgs e)
        {
            SaveTextPad();
        }
        private void fMain_Load(object sender, EventArgs e)
        {
            LoadTextPad();
        }
        private void rtbTextPad_TextChanged(object sender, EventArgs e)
        {
            Textt.allText = rtbTextPad.Text;
        }
        public void Selection()
        {
            rtbTextPad.Text = Textt.allText;
            lenghtText = Textt.findText.Length;
            if (!String.IsNullOrEmpty(rtbTextPad.Text))
            {
                rtbTextPad.SelectionStart = Textt.first[Textt.count];
                rtbTextPad.SelectionLength = lenghtText;
            }
        }
    }
}