How to raise some event using checkbox selected

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C#

ASP.NET

I have a Gridview with 6 rows and a checkbox. If I select one checkbox , I want to raise an event.
In my code, the checkbox is selected but not entering the event. Should any correction be made or can anyone guide me?

<asp:GridView ID="GridView1" runat="server"
style="z-index: 1; left: 195px; top: 495px; position: absolute; height: 152px; width: 232px">
<Columns>
<asp:TemplateField>
<ItemTemplate>
<asp:CheckBox ID="chkSelect1" runat="server" OnCheckedChanged="chkSelect1_checkedchanged"/>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>

protected void chkSelect1_checkedchanged(object sender, EventArgs e)
   {

   }