当我将字符串输出到 Windows 窗体中的选中列表框中时，只有字符串的第一行显示在复选框旁边

>当我点击下面的按钮方法时

private void button1_Click(object sender, EventArgs e)
    {
        string output;
        //Concatenate the text value of the 3 text boxes
        output = "Task: " + this.textBoxTask.Text + "'r'n";
        output += "Description: " + this.textBoxDescription.Text + "'r'n";
        output += "Due Date: " + this.textBoxDueDate.Text + "'r'n";
        this.checkedListBoxTasks.Items.Add(output);
    }

在复选框旁边显示的"任务：我在文本框中写的任何内容"行，是否可以使其显示其他两行？

this.checkedListBoxTasks.Items.Add(this.textBoxTask.Text);
this.checkedListBoxTasks.Items.Add(this.textBoxDescription.Text);
this.checkedListBoxTasks.Items.Add(this.textBoxDueDate.Text);