如何实现gridview 编辑时为Label，新增时为dropdownlist

前台
<asp:GridView ID="gvEventDispatcher" runat="server" DataKeyNames="EventCategoryID,DispatcherID" 
        AutoGenerateColumns="False" onprerender="gvEventDispatcher_PreRender" 
            onrowdatabound="gvEventDispatcher_RowDataBound" 
            onrowcancelingedit="gvEventDispatcher_RowCancelingEdit" 
            onrowediting="gvEventDispatcher_RowEditing" 
            onrowupdating="gvEventDispatcher_RowUpdating" 
            onrowcommand="gvEventDispatcher_RowCommand" 
            onrowdeleting="gvEventDispatcher_RowDeleting" >
            <Columns>
                    <asp:TemplateField HeaderText="EventName">
                    <ItemTemplate>
                    <asp:Label ID="lblEvent" Text='<%# Eval("EventName") %>' runat="server"></asp:Label>
                    </ItemTemplate>
                    <EditItemTemplate>
                    <asp:DropDownList ID="ddlEvent" runat="server"></asp:DropDownList>
                    </EditItemTemplate>
                    </asp:TemplateField>
                    <asp:TemplateField HeaderText="DispatcherName">
                    <ItemTemplate>
                    <asp:Label ID="lblDispatcher" Text='<%# Eval("DispatcherName") %>' runat="server"></asp:Label>
                    </ItemTemplate>
                    <EditItemTemplate>
                    <asp:DropDownList ID="ddlDispatcher" runat="server"></asp:DropDownList>
                    </EditItemTemplate>
                    </asp:TemplateField>
                    <asp:TemplateField HeaderText="FormatterName">
                    <ItemTemplate>
                    <asp:Label ID="lblFormatter" Text='<%# Eval("FormatterName") %>' runat="server"></asp:Label>
                    </ItemTemplate>
                    <EditItemTemplate>
                    <asp:DropDownList ID="ddlFormatter" runat="server"></asp:DropDownList>
                    </EditItemTemplate>
                    </asp:TemplateField>
                <asp:CommandField ShowEditButton="true" ShowDeleteButton="true" HeaderText="操作" EditText="修改" DeleteText="删除"
                    UpdateText="保存" CancelText="取消" ControlStyle-CssClass="LinkButton" />
                <%--<asp:HyperLinkField Text="详细" DataNavigateUrlFields="ID" Target="_blank" DataNavigateUrlFormatString="RegionFormulaManage.aspx?ID={0}" />--%>
            </Columns>
        </asp:GridView><asp:LinkButton ID="lbtnAdd" CssClass="LinkBtn" runat="server" 
                    onclick="lbtnAdd_Click">Create a EventDispatcher Domain</asp:LinkButton>后台if (e.Row.RowState == DataControlRowState.Edit || e.Row.RowState == (DataControlRowState.Alternate | DataControlRowState.Edit))
                {
                    
                    DropDownList ddlFormatters = (DropDownList)e.Row.FindControl("ddlFormatter");
                    foreach (string formatterName in EventService.GetAllFormatterName())
                        ddlFormatters.Items.Add(new ListItem(formatterName));
                    DropDownList ddlEvents = (DropDownList)e.Row.FindControl("ddlEvent");
                    foreach (string eventName in EventService.GetAllEventCategoryName())
                        ddlEvents.Items.Add(new ListItem(eventName));
                    DropDownList ddlDispatchers = (DropDownList)e.Row.FindControl("ddlDispatcher");
                    foreach (string dispatcherName in EventService.GetAllDispatcherName())
                        ddlDispatchers.Items.Add(new ListItem(dispatcherName));
}点击gridview编辑，前2个显示为label，第3个是dropdownlist
而点击外面linkbutton新增，3个都为dropdownlist应该怎么改，现在编辑和新增都是dropdownlist