在C#中使用鼠标绘制线条的正确方法是什么？

using System;
using System.Drawing;
using System.Windows.Forms;

public class DrawingForm : Form
{
    private Point startPoint;
    private Point endPoint;

    public DrawingForm()
    {
        // 设置窗体属性
        this.Size = new Size(800, 600);
        this.BackColor = Color.White;

        // 注册鼠标事件
        this.MouseDown += DrawingForm_MouseDown;
        this.MouseMove += DrawingForm_MouseMove;
        this.MouseUp += DrawingForm_MouseUp;
    }

    private void DrawingForm_MouseDown(object sender, MouseEventArgs e)
    {
        // 记录起始点
        startPoint = e.Location;
    }

    private void DrawingForm_MouseMove(object sender, MouseEventArgs e)
    {
        // 更新终点
        if (e.Button == MouseButtons.Left)
        {
            endPoint = e.Location;
            this.Invalidate(); // 刷新窗体，触发重绘
        }
    }

    private void DrawingForm_MouseUp(object sender, MouseEventArgs e)
    {
        // 绘制最终的线条
        endPoint = e.Location;
        this.Invalidate();
    }

    protected override void OnPaint(PaintEventArgs e)
    {
        base.OnPaint(e);

        // 绘制线条
        using (Pen pen = new Pen(Color.Black, 2))
        {
            e.Graphics.DrawLine(pen, startPoint, endPoint);
        }
    }

    public static void Main()
    {
        Application.Run(new DrawingForm());
    }
}