PractikaKazarin03/Form4.cs

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 KazarinPractica03
{
    public partial class Form4 : Form
    {
        public Form4()
        {
            InitializeComponent();
            // задаем обработчик события
            linkLabel1.LinkClicked += linkLabel1_LinkClicked;
            AutoCompleteStringCollection source = new AutoCompleteStringCollection()
                {
                    "Кузнецов",
                    "Иванов",
                    "Петров",
                    "Кустов"
                };
            textBox2.AutoCompleteCustomSource = source;
            textBox2.AutoCompleteMode = AutoCompleteMode.SuggestAppend;
            textBox2.AutoCompleteSource = AutoCompleteSource.CustomSource;
            textBox4.TextChanged += textBox4_TextChanged;
            
        }
        private void linkLabel1_LinkClicked(object sender, LinkLabelLinkClickedEventArgs e)
        {
            System.Diagnostics.Process.Start("http://metanit.com");
        }
        private void textBox4_TextChanged(object sender, EventArgs e)
        {
            label4.Text = textBox4.Text;
        }
       
        private void Form4_Load(object sender, EventArgs e)
        {

        }

        private void checkBox1_CheckedChanged(object sender, EventArgs e)
        {
            CheckBox checkBox = (CheckBox)sender; // приводим отправителя к элементу типа CheckBox
            if (checkBox.Checked == true)
            {
                MessageBox.Show("Флажок " + checkBox.Text + "  теперь отмечен");
            }
            else
            {
                MessageBox.Show("Флажок " + checkBox.Text + "  теперь не отмечен");
            }
        }
    }
}