Question

C#我照书上打的代码，但是出现了这个错误怎么改

C#我照书上打的代码，但是出现了这个错误怎么改就是想在窗体里出现一条直线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;
using System.Drawing.Drawing2D;
using System.Drawing.Imaging;
using System.Drawing.Text;

namespace WindowsFormsApplication7
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
public void DrawLine(Pen pen,Point startPoint,Point endPoint);
private void Form1_Paint(object sender, PaintEventArgs e)
{
Graphics g = e.Graphics;
Pen pen = new Pen(Color.Blue,3);
Point startPoint = new Point(20,20);
Point endPoint = new Point(200,90);
g.DrawLine(pen,startPoint,endPoint);
}

private void Form1_Load(object sender, EventArgs e)
{

}
}
}

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Answer 1

public　void　Drawline（xxxxx）
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Private　void　From1＿Paint（××××××××××）
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