问为什么在我的网格视图ASP.NET中有一个<td>&nbsp;</td>

EN

<asp:GridView ID="gvLocation" runat="server" AutoGenerateColumns="false" ShowFooter="true" 
            ShowHeaderWhenEmpty="true" AllowPaging="True" OnPageIndexChanging="gvLocation_PageIndexChanging"
            OnRowEditing="gvLocation_RowEditing" OnRowCancelingEdit="gvLocation_RowCancelingEdit"
            AllowSorting="true" onsorting="gvLocation_Sorting" ridLines="None" CssClass="mGrid" PagerStyle-CssClass="pgr" AlternatingRowStyle-CssClass="alt" CellPadding="3">
            <%-- Theme Properties --%>
            <Columns>  
                <asp:TemplateField HeaderText="Armario" SortExpression="armario">
                    <ItemTemplate>
                        <asp:Label CssClass="gridTextbox" ID="lblCloset" Text='<%# Eval("armario")%>' runat="server" />
                    </ItemTemplate>
                    <EditItemTemplate>
                        <asp:TextBox CssClass="gridTextbox" ID="txtCloset" Text='<%# Eval("armario")%>' runat="server" />
                    </EditItemTemplate>
                    <FooterTemplate>
                        <asp:TextBox CssClass="gridTextbox" ID="txtClosetFooter" runat="server" />
                    </FooterTemplate>
                </asp:TemplateField>  
                <asp:TemplateField HeaderText="Cajon" SortExpression="cajon">
                    <ItemTemplate>                       
                        <asp:Label CssClass="gridTextbox" ID="lblDrawer" Text='<%# Eval("cajon")%>' runat="server" />
                    </ItemTemplate>
                    <EditItemTemplate>
                        <asp:TextBox CssClass="gridTextbox" ID="txtDrawer" Text='<%# Eval("cajon")%>' runat="server" />
                    </EditItemTemplate>
                    <FooterTemplate>
                        <asp:TextBox  CssClass="gridTextbox" ID="txtDrawerFooter" runat="server" />
                    </FooterTemplate>
                </asp:TemplateField>       
                <asp:TemplateField>
                    <ItemTemplate>
                        <asp:ImageButton ImageUrl="~/Images/edit.png" runat="server" CommandName="Edit" ToolTip="Edit" Width="20px" Height="20px"/>
                        <asp:ImageButton ImageUrl="~/Images/delete.png" runat="server" CommandName="Delete" ToolTip="Delete" Width="20px" Height="20px"  OnClick="deleteItem"/>
                    </ItemTemplate>
                    <EditItemTemplate>
                        <asp:ImageButton ImageUrl="~/Images/save.png" runat="server" CommandName="Update" ToolTip="Update" Width="20px" Height="20px"  OnClick="updateItem"/>
                        <asp:ImageButton ImageUrl="~/Images/cancel.png" runat="server" CommandName="Cancel" ToolTip="Cancel" Width="20px" Height="20px"/>
                    </EditItemTemplate>
                    <FooterTemplate>
                        <asp:ImageButton ImageUrl="~/Images/addnew.png" ID="addNewLocation" runat="server" CommandName="AddNew" ToolTip="Add New" Width="20px" Height="20px" OnClick="addNew"/>
                    </FooterTemplate>
                </asp:TemplateField>
                 <asp:TemplateField HeaderText="ubicacion id" SortExpression="ubicacion_componente_id" ItemStyle-CssClass="hideGridColumn" HeaderStyle-CssClass="hideGridColumn">
                    <ItemTemplate>
                        <asp:Label CssClass="gridTextbox" ID="lblLocationID"  Text='<%# Eval("ubicacion_componente_id")%>' runat="server" />
                    </ItemTemplate>
                </asp:TemplateField>  
            </Columns>
        </asp:GridView>

.hideGridColumn
{
    display: none;
}