footer template not displaying in gridview

hey, i have a gridview in everything is working fine means editing updating etc but insert is not working..i have add footer template and given textboxes nd insert linkbutton....but it is not displaying....y it is happening any one please help
aspx code is somethng like below

<asp:TemplateField>
                <EditItemTemplate>
                    <asp:Label ID="lbleditname" runat="server" Text='<%#Eval("name")%>'></asp:Label>
                </EditItemTemplate>
                <HeaderTemplate>
                    name
                </HeaderTemplate>
                <ItemTemplate>
                    <asp:Label ID="lblname" runat="server" Text='<%#Eval("name")%>'></asp:Label>
                </ItemTemplate>
                <FooterTemplate>
                    <asp:TextBox ID="txtn" runat="server"></asp:TextBox>
                </FooterTemplate>
            </asp:TemplateField>
            <asp:TemplateField>
                <EditItemTemplate>
                    &nbsp;<asp:TextBox ID="TextBox1"  runat ="server"  Text='<%#Eval("decription")%>'></asp:TextBox>
                </EditItemTemplate>

nd asp.cs is as belows

 protected void GridView1_RowCommand(object sender, GridViewCommandEventArgs e)
    {
        dbc.myconnection();
        if(e.CommandName.Equals("Add"))
        {
            TextBox txt1 = (TextBox)GridView1.FooterRow.FindControl("txtn");
            TextBox txt2 = (TextBox)GridView1.FooterRow.FindControl("txtd");
            SqlCommand cmd = new SqlCommand("insert into dmlwithingrid(name, decription)values('"+txt1 .Text +"', '"+txt2 .Text +"')", dbc .sqlcon );
            cmd.ExecuteNonQuery();
        }

    }