How to trigger the checkChanged event of the checkbox inside a DataGrid

<asp:DataGrid id='DataGrid1' runat='server'>
	<Columns>
	<asp:TemplateColumn HeaderText='Boolean Value'>
		<ItemTemplate>
		<asp:CheckBox id=CheckBox1 runat='server' onCheckedChanged='chkChanged' Checked=’<%# DataBinder.Eval(Container.DataItem, 'Discontinued') %>’ AutoPostBack='True'>
		</asp:CheckBox>
		</ItemTemplate>
	</asp:TemplateColumn>
	</Columns>
</asp:DataGrid>

VB.NET

Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
       	 ’Put user code to initialize the page here
        	If Not IsPostBack Then
           		’Populate the datagrid
        	End If
End Sub

protected Sub chkChanged(ByVal sender As Object, ByVal e As System.EventArgs)
	Response.Write('CheckChanged Event')
End Sub

C#

private void Page_Load(object sender, System.EventArgs e)
{
	// Put user code to initialize the page here
	if (!Page.IsPostBack )
	{
		DataGrid1.DataSource =BindDataClass.BindData ();
		DataGrid1.DataBind ();
	}
}

protected void chkChanged(object sender , System.EventArgs   e  )
{
	Response.Write('CheckChanged Event');
}