引用Microsoft.VisualBasic

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace Q759010
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button3_Click(object sender, EventArgs e)
        {
            if (listBox1.SelectedItem != null)
                listBox1.Items.Remove(listBox1.SelectedItem);
        }

        private void button2_Click(object sender, EventArgs e)
        {
            listBox1.Items.Add(Microsoft.VisualBasic.Interaction.InputBox("输入球队名", "新增"));
        }

        private void button1_Click(object sender, EventArgs e)
        {
            if (listBox1.SelectedItem != null)
                listBox1.Items[listBox1.SelectedIndex] = Microsoft.VisualBasic.Interaction.InputBox("输入新的球队名", "修改", listBox1.SelectedItem.ToString());
        }
    }
}

以下是C#的代码 不明白的可以追问！
请采纳！
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace shuangji
{
public partial class frmMain : Form
{
public frmMain()
{
InitializeComponent();
}

    private void btnDelete_Click(object sender, EventArgs e)
    {
        if (listBox1.SelectedItem != null)
            listBox1.Items.Remove(listBox1.SelectedItem);
    }

    private void btnAdd_Click(object sender, EventArgs e)
    {
        FormAdd f = new FormAdd();
                    f.Text = "增加";
                    f.ShowDialog();
                     listBox1.Items.Add(f.AddText);
    }

    private void btnEdit_Click(object sender, EventArgs e)
    {
        if (listBox1.SelectedItem != null)
                    {
                     FormAdd f = new FormAdd();
                    f.AddText = listBox1.Items[listBox1.SelectedIndex].Text;
                    f.Text = "修改";
                    f.ShowDialog();
            listBox1.Items[listBox1.SelectedIndex] = f.AddText;
                            }
    }
}

}