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); 
                }
            }
        }