asd

20240408/WindowsFormsApp1/Form1.cs

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+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 WindowsFormsApp1
+{
+    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)
+        {
+            int index = listBox1.SelectedIndex;
+            if (index != -1)
+            {
+                listBox1.Items.RemoveAt(index);
+            }
+        }
+
+        private void button3_Click(object sender, EventArgs e)
+        {
+            listBox1.Items.Clear();
+        }
+    }
+}