Find out how many checkboxes are checked

<asp:GridView ID="grd1"  runat="server" AutoGenerateColumns="false">
            <Columns>
                <asp:TemplateField>
                    <ItemTemplate>
                        <asp:CheckBox ID="Chk1" runat="server" />
                    </ItemTemplate>
                </asp:TemplateField>
                <asp:BoundField DataField="NAme" HeaderText="NAme" />
                <asp:BoundField DataField="EmpID" HeaderText="EmpID" />
                                <asp:TemplateField>
                    <ItemTemplate>
                        <asp:LinkButton ID="lnk1" runat="server" Text="Click" OnClick="lnk1_Click"></asp:LinkButton>
                    </ItemTemplate>
                                    </asp:TemplateField>
            </Columns>
        </asp:GridView>

protected void lnk1_Click(object sender, EventArgs e)
        {
            int i = 0;
            foreach (GridViewRow item in grd1.Rows)
            {
                CheckBox chckNo = (CheckBox)item.FindControl("Chk1");
                if (chckNo.Checked)
                {
                    i = i+1;    
                }
            }
            Response.Write(" Total Check boxes " + i);
        }