unable to print page ,document_PrintPage doesnt exist

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C#3.5

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.Printing;
using System.Drawing.Imaging;

namespace WindowsFormsApplication1
{
public partial class Admission : Form
{
private System.Drawing.Printing.PrintDocument docToPrint;
public Admission()
{
InitializeComponent();
docToPrint = new System.Drawing.Printing.PrintDocument();
docToPrint.PrintPage += document_PrintPage; // ERROR HERE
}

private void exitToolStripMenuItem_Click(object sender, EventArgs e)
{
this.Close();
}


private void printToolStripMenuItem_Click(object sender, EventArgs e)
{
PrintDialog PrintDialog1 = new PrintDialog();
// Allow the user to choose the page range he or she would
// like to print.
PrintDialog1.AllowSomePages = true;

// Show the help button.
PrintDialog1.ShowHelp = true;

// Set the Document property to the PrintDocument for
// which the PrintPage Event has been handled. To display the
// dialog, either this property or the PrinterSettings property
// must be set
PrintDialog1.Document = docToPrint;

DialogResult result = PrintDialog1.ShowDialog();

// If the result is OK then print the document.
if (result == DialogResult.OK)
{
docToPrint.Print();
}
}


}
}