如何调用listbox中某行的内容给label 和 button，同时是两边数值是同步的？c# winform

Question

listbox中调取某行（例如第三行）的内容给另一个窗体（非子窗体）的button 和label，同时修改了listbox那行内容，button和label同步改变？并且如果该值被删除了，button和label内容也被删除。

Answer 1

label form代码
public AddRenameWindow addrename { get; set; }
//connect with addrename form 's data

    public void AlterWindow_Load(object sender, EventArgs e)
    {
        //show  teams' name in addrenmae form on this form 
        label4.Text = AddRenameWindow.a[0];
        label5.Text = AddRenameWindow.a[1];
        label6.Text = AddRenameWindow.a[2];
        label7.Text = AddRenameWindow.a[3];
        label8.Text = AddRenameWindow.a[4];
        label9.Text = AddRenameWindow.a[5];
        label10.Text = AddRenameWindow.a[6];
        label11.Text = AddRenameWindow.a[7];
        label12.Text = AddRenameWindow.a[8];
        label13.Text = AddRenameWindow.a[9];
        label14.Text = AddRenameWindow.a[10];
        label15.Text = AddRenameWindow.a[11];
        label16.Text = AddRenameWindow.a[12];
        label17.Text = AddRenameWindow.a[13];
        label18.Text = AddRenameWindow.a[14];
        label19.Text = AddRenameWindow.a[15];
        label20.Text = AddRenameWindow.a[16];
        label21.Text = AddRenameWindow.a[17];
    }

listbox form代码
        public AlterWindow alter { get; set; }
         public static string[] a = new string[30];
        public void button4_Click(object sender, EventArgs e)
        {
            AlterWindow alter = new AlterWindow();

            for (int index = 0; index < listBox1.Items.Count; index++)
            {
                a[index] = Convert.ToString(listBox1.Items[index]);
                //MessageBox.Show(a[i].ToString());
            }
                this.Close();
            }
        }
自己用蠢办法做出来了，虽然蠢但是同步功能完美。
![图片说明](https://img-ask.csdn.net/upload/201906/26/1561481978_125478.png)![图片说明](https://img-ask.csdn.net/upload/201906/26/1561481990_664584.png)


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