Event not fire in grid view

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ASP.NET

i want to provide custom paging in grid view...

<asp:GridView ID="gvFirst" runat="server" AutoGenerateColumns="false"
            AllowPaging="true"
            ondatabound="gvFirst_DataBound" >
            <Columns>
                <asp:BoundField DataField="ID" HeaderText="ProductID"/>
                <asp:BoundField DataField="Name" HeaderText="ProductName" />
            </Columns>
            <PagerTemplate>
                <asp:Panel ID="pnlPager" runat="server">
                </asp:Panel>
            </PagerTemplate>
        </asp:GridView>

If i create button here and bind click event then it is fire...but problem is this evet occur for each row bind with grid

protected void gvFirst_RowCreated(object sender, GridViewRowEventArgs e)
       {
           if (e.Row.RowType == DataControlRowType.Pager)
           {
               Panel pnPager = e.Row.FindControl("pnlPager") as Panel;
               if (pnPager != null)
               {
                   Button btnFirst = new Button();
                   btnFirst.Text = "1";
                   btnFirst.Click += new EventHandler(btnFirst_Click);
                   pnPager.Controls.Add(btnFirst);
               }
           }
       }

If i create button here and bind click event then it is not fire...this event fire after all the rows bind to grid..so it will occur only once..

protected void gvFirst_DataBound(object sender, EventArgs e)
        {
            GridViewRow gvRow = gvFirst.BottomPagerRow;
            if (gvRow != null)
            {
                Panel pnPager = gvRow.FindControl("pnlPager") as Panel;
                if (pnPager != null)
                {
                    Button btnFirst = new Button();
                    btnFirst.Text = "1";
                    btnFirst.Click += new EventHandler(btnFirst_Click);
                    pnPager.Controls.Add(btnFirst);
                }
            }
        }

        void btnFirst_Click(object sender, EventArgs e)
        {
            using (_NorthWindDataContext = new NorthWindDataContext())
            {
                var ProductInformation = from p in _NorthWindDataContext.Products
                                         select new
                                         {
                                             ID = p.ProductID,
                                             Name = p.ProductName
                                         };
                gvFirst.DataSource = ProductInformation.Skip(5).Take(5);
                gvFirst.DataBind();
            }
        }

pls help me to understand this...
**Another problem which i am facing is**...
i want to provide custom paging , now i have set page size to 5 and i am fetching 5 record from query so my grid pager is not display please help me out of this...