c#用pictureBox绘制网格

  第一次写东西，找了很多东西，终于自己也能绘制网格了，虽然有些东西是借鉴别人的，不过也学到了一些关于GDI绘制的知识，以下是代码：

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 MainForm
{
public partial class Form1 : Form
{
Graphics m_picture;
int Row = 20;
int colums = 20;
public Form1()
{
InitializeComponent();

}
private void DrawGrid(Graphics gp)
{
for (int i = 0; i < Row; i++)
{
gp.DrawLine(new Pen(Color.SkyBlue),(i + 1) * pcCanvs.Width / Row,0, (i + 1) * pcCanvs.Width / Row, pcCanvs.Height);
}
for (int i = 0; i < colums; i++)
{
gp.DrawLine(new Pen(Color.SkyBlue),0,(i+1)*pcCanvs.Height/colums,pcCanvs.Width, (i + 1) * pcCanvs.Height / colums);
}
}

private void Form1_Load(object sender, EventArgs e)
{
pcCanvs.BorderStyle = BorderStyle.Fixed3D;
pcCanvs.Focus();
m_picture = pcCanvs.CreateGraphics();
Bitmap canvas = new Bitmap(pcCanvs.Width, pcCanvs.Height);
Graphics gp = Graphics.FromImage(canvas);
DrawGrid(gp);
pcCanvs.BackgroundImage = canvas;
pcCanvs.Refresh();
}
}
}

以下是运行效果：