在UpdatePanel中找不到具有ID''的控件

Question

我有一个带有6个模板字段的gridview，其中是速率和数量。当根据该值更改速率和数量时，总量将会发生变化。我使用了ajaxtoolkit和更新面板，但更改不起作用总场。

这是我的代码

ASPX

<tr>
   <td colspan="5">

  <asp:GridView ID="gvOrder" runat="server" AutoGenerateColumns="False" 
  CellPadding="3" HorizontalAlign="Center" OnRowCreated="gvOrder_RowCreated"
  BackColor="White" BorderColor="#CCCCCC" Font-Size="Small"
  BorderStyle="None" BorderWidth="1px" ShowFooter="True" Width="950px" >
                               <Columns>
     <asp:TemplateField HeaderText="Product Name">
                <ItemTemplate>
                    <asp:DropDownList ID="drpproduct" Width="200px" runat="server" DataValueField="PName"
                    onselectedindexchanged="drpproduct_SelectedIndexChanged" AutoPostBack="true" > 
                 </asp:DropDownList>
                </ItemTemplate>
                <HeaderStyle Width="200px" />
            </asp:TemplateField>

             <asp:TemplateField HeaderText="Sub Item">
                <ItemTemplate>
                     <asp:UpdatePanel ID="Upsubitem" runat="server"  UpdateMode="Conditional" RenderMode="Inline">
                        <Triggers>
                            <asp:AsyncPostBackTrigger ControlID="drpproduct" EventName="TextChanged" />
                        </Triggers>
                    <ContentTemplate>
                        <asp:DropDownList ID="drpsubitem" Width="200px" runat="server" DataValueField="BName"
                        onselectedindexchanged="drpsubitem_SelectedIndexChanged" AutoPostBack="true" >
                          </asp:DropDownList> 
                    </ContentTemplate>
                    </asp:UpdatePanel>


                </ItemTemplate>
                <HeaderStyle Width="200px" />
            </asp:TemplateField>

            <asp:TemplateField HeaderText="Quantity">
                <ItemTemplate>
                    <asp:UpdatePanel ID="upqty" runat="server"  UpdateMode="Conditional" RenderMode="Inline">
                        <Triggers>
                            <asp:AsyncPostBackTrigger ControlID="drpproduct" EventName="TextChanged" />
                        </Triggers>
                    <ContentTemplate>
                        <asp:TextBox ID="txtquantity" runat="server" MaxLength="5" CssClass="textb" Width="70px" OnTextChanged="QtyChanged" AutoPostBack="true"  ></asp:TextBox>
                    </ContentTemplate>
                    </asp:UpdatePanel>
                </ItemTemplate>
                <HeaderStyle Width="70px" />
            </asp:TemplateField>

            <asp:TemplateField HeaderText="Unit">
                <ItemTemplate>
                     <asp:UpdatePanel ID="upUnit" runat="server"  UpdateMode="Conditional" RenderMode="Inline">
                        <Triggers>
                            <asp:AsyncPostBackTrigger ControlID="drpproduct" EventName="TextChanged" />
                        </Triggers>
                    <ContentTemplate>
                        <asp:TextBox ID="txtunit" runat="server" CssClass="textb" Width="60px" Enabled="false" ></asp:TextBox>
                    </ContentTemplate>
                    </asp:UpdatePanel>

                </ItemTemplate>
                <HeaderStyle Width="60px" />
            </asp:TemplateField>

            <asp:TemplateField HeaderText="Rate">
                <ItemTemplate>
                     <asp:UpdatePanel ID="UpRate" runat="server"  UpdateMode="Conditional" RenderMode="Inline">
                        <Triggers>
                            <asp:AsyncPostBackTrigger ControlID="drpsubitem" EventName="TextChanged" />
                            <asp:AsyncPostBackTrigger ControlID="drpproduct" EventName="TextChanged" />
                        </Triggers>
                    <ContentTemplate>
                        <asp:TextBox ID="txtrate" runat="server" CssClass="textb" Width="70px" MaxLength="5" OnTextChanged="RateChanged" AutoPostBack="true" ></asp:TextBox>
                    </ContentTemplate>
                    </asp:UpdatePanel>

                </ItemTemplate>

                <HeaderStyle Width="70px" />
            </asp:TemplateField>
            <asp:TemplateField HeaderText="Amount">
                <ItemTemplate>
                     <asp:UpdatePanel ID="UpAmount" runat="server"  UpdateMode="Conditional" RenderMode="Inline">
                        <Triggers>
                            <asp:AsyncPostBackTrigger ControlID="drpproduct" EventName="TextChanged" />
                            <asp:AsyncPostBackTrigger ControlID="drpsubitem" EventName="TextChanged" />
                            <asp:AsyncPostBackTrigger ControlID="txtrate" EventName="TextChanged" />
                            <asp:AsyncPostBackTrigger ControlID="txtquantity" EventName="TextChanged" />
                        </Triggers>
                    <ContentTemplate>
                        <asp:TextBox ID="txtamt" runat="server" OnTextChanged="AmtChanged" AutoPostBack="true" CssClass="textb" Width="80px" MaxLength="20" ></asp:TextBox>
                    </ContentTemplate>
                    </asp:UpdatePanel>

                </ItemTemplate>
                <FooterStyle HorizontalAlign="Center" />
                <FooterTemplate>
                     <asp:Button ID="ButtonAdd" runat="server" 
                                 Text="Add New Row" onclick="ButtonAdd_Click"
                                   Width="100" />
                </FooterTemplate>
                <HeaderStyle Width="80px" />
            </asp:TemplateField>

            <asp:TemplateField HeaderText="PCode">
                 <ItemTemplate>
                  <asp:UpdatePanel ID="UpProductCode" runat="server"  UpdateMode="Conditional" RenderMode="Inline">
                        <Triggers>
                            <asp:AsyncPostBackTrigger ControlID="drpproduct" EventName="TextChanged" />
                        </Triggers>
                    <ContentTemplate>
                       <asp:Label ID="lblpcode" runat="server" Text="" Width="10px" Enabled="false"></asp:Label>
                    </ContentTemplate>
                    </asp:UpdatePanel>

                </ItemTemplate>
                 <HeaderStyle Width="10px" />
            </asp:TemplateField>

            <asp:TemplateField HeaderText="SCode">
                 <ItemTemplate>
                  <asp:UpdatePanel ID="UpSubitemCode" runat="server"  UpdateMode="Conditional" RenderMode="Inline">
                        <Triggers>
                            <asp:AsyncPostBackTrigger ControlID="drpproduct" EventName="TextChanged" />
                            <asp:AsyncPostBackTrigger ControlID="drpsubitem" EventName="TextChanged" />
                        </Triggers>
                    <ContentTemplate>
                       <asp:Label ID="lblscode" runat="server" Text="" Width="10px" Enabled="false"></asp:Label>
                    </ContentTemplate>
                    </asp:UpdatePanel>

                </ItemTemplate>
                 <HeaderStyle Width="10px" />
            </asp:TemplateField>
            </Columns>      

                <FooterStyle BackColor="White" ForeColor="#000066" />
                <HeaderStyle BackColor="#006699" Font-Bold="True" ForeColor="White" />
                <PagerStyle BackColor="White" ForeColor="#000066" HorizontalAlign="Left" />
                <RowStyle ForeColor="#000066" />
                <SelectedRowStyle BackColor="#669999" Font-Bold="True" ForeColor="White" />
                <SortedAscendingCellStyle BackColor="#F1F1F1" />
                <SortedAscendingHeaderStyle BackColor="#007DBB" />
                <SortedDescendingCellStyle BackColor="#CAC9C9" />
                <SortedDescendingHeaderStyle BackColor="#00547E" />

        </asp:GridView>
</td>
</tr>

<tr>
<td style="width:15%;">
     <asp:Label ID="Label8" runat="server" CssClass="tranlbl" Text="Total Qunatity :"></asp:Label>
</td>
<td style="width:25%;">

                        <asp:TextBox ID="txttotqty" runat="server" CssClass="texttot" Width="180px" 
        Enabled="False" ></asp:TextBox>



</td>
<td style="width:20%;">
</td>
<td style="width:15%;">
     <asp:Label ID="Label9" runat="server" CssClass="tranlbl" Text="Total Amount :"></asp:Label>
</td>
<td style="width:25%;">
    <asp:UpdatePanel ID="uptotamt" runat="server"  UpdateMode="Conditional" RenderMode="Inline">
                        <Triggers>
                            <asp:AsyncPostBackTrigger ControlID="txtrate" EventName="TextChanged" />
                        </Triggers>
                    <ContentTemplate>
                       <asp:TextBox ID="txttot" runat="server" CssClass="texttot" Width="180px" 
        Enabled="False" ></asp:TextBox>
                    </ContentTemplate>
                    </asp:UpdatePanel>

</td>
</tr>

每个项目字段都有一些在文本更改期间触发的事件。但是txttot数量不会改变。

代码背后

protected void RateChanged(object sender, EventArgs e)
{
    GridViewRow row = (GridViewRow)drpsubitem.NamingContainer;
    TextBox prate = (TextBox)row.FindControl("txtrate");
    TextBox pqty = (TextBox)row.FindControl("txtquantity");
    TextBox pamt = (TextBox)row.FindControl("txtamt");
    pamt.Text = Convert.ToString(float.Parse(prate.Text) * Convert.ToInt32(pqty.Text));
    float gvamt = 0;
    int gqty = 0;
    foreach (GridViewRow g1 in gvOrder.Rows)
    {
        gvamt = gvamt + float.Parse(pamt.Text);
        gqty = gqty + Convert.ToInt32(pqty.Text);
    }
    txttot.Text = Convert.ToString(gvamt);
    txttotqty.Text = Convert.ToString(gqty);
}