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 _7th_Program_ListboxAddRemove
    {
        public partial class Form1 : Form
        {
            public Form1()
            {
                InitializeComponent();
            }
            private void button1_Click(object sender, EventArgs e)
            {
                listBox1.Items.Add(textBox1.Text);
            }
            private void button2_Click(object sender, EventArgs e)
            {
                listBox1.Items.Remove(textBox1.Text);
            }
            private void button3_Click(object sender, EventArgs e)
            {
                listBox2.Items.Remove(textBox2.Text);
            }
            private void button4_Click(object sender, EventArgs e)
            {
                listBox2.Items.Add(textBox2.Text);
            }
            private void button5_Clickstrong>(object sender, EventArgs e)
            {
                listBox2.Items.Add(listBox1.Text);
                listBox1.Items.Remove(listBox1.Text);
            }
            private void button6_Click(object sender, EventArgs e)
            {
                listBox1.Items.Add(listBox2.Text);
                listBox2.Items.Remove(listBox2.Text);
            }
            private void button7_Click(object sender, EventArgs e)
            {
                for (int k = 0 ; k < listBox1.Items.Count ; k++ ) 
                {
                    listBox2.Items.Add(listBox1.Items[k]);
                }
                listBox1.Items.Clear();
            }
            private void button8_Click(object sender, EventArgs e)
            {
                for (int k = 0; k < listBox2.Items.Count; k++)
                {
                    listBox1.Items.Add(listBox2.Items[k]);
                }
                listBox2.Items.Clear();
            }
        }
    }