的ASP.NET圖像按鈕確認

我有一些形式的ASP.NET服務器控件，我想驗證一個asp.net 文本框中空當圖像按鈕被按下，而無需使用Java腳本的，因爲這圖像按鈕不是數據發佈按鈕，相關錯誤標籤根本不顯示任何錯誤。的ASP.NET圖像按鈕確認

代碼

protected void ImageButtonAddItem_Click(object sender, ImageClickEventArgs e) 
     { 
      if (!TextBoxItemCode.Text.Trim().Equals(string.Empty)) 
      { 
       poDetails.Add(
           new PurchaseOrderDetail 
            { 
             ItemDetail = new ItemService().GetItemByID(Convert.ToInt32(TextBoxItemCode.Text.Trim())), 
             POQty = Convert.ToInt32(TextBoxQty.Text), 
             ItemUOM = DropDownListUOM.SelectedItem.Text, 
             ActiveStatus = true 
            } 
             ); 
      } 
      else 
      { 
       labelerror.Text = "Please select an item to Add ."; 

      } 

      GridViewPurchaseOrder.DataSource = poDetails; 
      GridViewPurchaseOrder.DataBind(); 
     }

labelerror.Text = 「請選擇一個項目的補充。」部分未得到更新，即使它獲得通過斷點

protected void Page_Load(object sender, EventArgs e) 
     { 
      if (!Session["SessionID"].ToString().Equals(Session.SessionID.ToString())) 
      { 
       Response.Redirect("~/User/Login.aspx"); 
      } 
      if (!new UserPermitionLevelsServices().GetPermissionByID(
      Convert.ToInt16(Session["LoginGroupID"].ToString()), 
      Convert.ToInt16(Session["LoginUserID"].ToString()) 
      , new FormServices().GetFormByName("PurchaseOrder"), 0)) 
      { 
       labelerror.Text = "No Authority To Use This Resource"; 
       LockControls(false); 
      } 
      else 
      { 
       labelerror.Text = ""; 
       LockControls(true); 
      } 
      supplierID = Convert.ToInt16(Request.QueryString["supplierID"]); 
      DropDownLocationList.Items.Add("--Select--"); 
      if (!IsPostBack) 
      { 
       MultiViewMain.ActiveViewIndex = 0; 
       MultiViewItem.ActiveViewIndex = 0; 
       if (supplierID != 0) 
       { 
        GetSupplierByID(supplierID); 
       } 
       PopulateUOMList(); 
       PopulateLocations(); 
      } 
     }

HTML

<%@ Page Title="" Language="C#" MasterPageFile="~/Classic.Master" AutoEventWireup="true" 
 
    CodeBehind="PurchaseOrder.aspx.cs" Inherits="NewClient.OrderProcessing.UI.Transaction.PurchaseOrder" %> 
 

 
<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="asp" %> 
 

 
<asp:Content ID="Content1" ContentPlaceHolderID="head" runat="server"> 
 
</asp:Content> 
 
<asp:Content ID="Content2" ContentPlaceHolderID="body" runat="server"> 
 
    <%-- <asp:ScriptManager ID="ScriptManager1" runat="server"></asp:ScriptManager> --%> 
 
    <asp:ToolkitScriptManager ID="ToolkitScriptManager1" runat="server" EnablePartialRendering="true" CombineScripts="false"> 
 
    </asp:ToolkitScriptManager> 
 
    <div style="text-align: center"> 
 
     <asp:Label ID="labelerror" runat="server" Text="Error" CssClass="errorLabel" 
 
      EnableViewState="False"></asp:Label> 
 
    </div> 
 
    <br /> 
 
    <div style="width: 750px; height: 524px"> 
 
     <asp:UpdatePanel runat="server" ID="upnlSerachSupplier"> 
 
      <ContentTemplate> 
 
       <asp:MultiView ID="MultiViewMain" runat="server"> 
 
        <asp:View ID="View1" runat="server"> 
 
         <div style="z-index: 100; left: 1px; width: 700px; position: relative; top: 1px; 
 
          height: 230px"> 
 
          <asp:Label ID="Label1" runat="server" Style="z-index: 103; left: 10px; position: absolute; 
 
           top: 20px" Width="92px">Order No</asp:Label> 
 
          <asp:TextBox ID="TextBoxOrderNo" runat="server" Width="100px" Style="z-index: 100; 
 
           left: 80px; position: absolute; top: 20px" >0001</asp:TextBox> 
 
          <asp:Label ID="Label2" runat="server" Style="z-index: 103; left: 200px; position: absolute; 
 
           top: 20px" Width="92px">Order Ref. No</asp:Label> 
 
          <asp:TextBox ID="TextBoxOrderRefNo" runat="server" Width="100px" Style="z-index: 100; 
 
           left: 300px; position: absolute; top: 20px" /> 
 
          <asp:RequiredFieldValidator ID="RV1" runat="server" ErrorMessage="*" Style="z-index: 100; 
 
           left: 405px; position: absolute; top: 20px; width: 10px" ForeColor="Red" ControlToValidate="TextBoxOrderRefNo" 
 
           ValidationGroup="save" Font-Bold="True" Font-Size="Larger" /> 
 
          <asp:Label ID="Label3" runat="server" Style="z-index: 103; left: 425px; position: absolute; 
 
           top: 20px" Width="92px">Location</asp:Label> 
 
          <asp:DropDownList ID="DropDownLocationList" runat="server" Style="z-index: 100; left: 485px; 
 
           position: absolute; top: 20px" Width="109px" /> 
 
          <asp:RequiredFieldValidator ID="RV2" runat="server" ErrorMessage="Select Location" 
 
           InitialValue="--Select--" Style="z-index: 100; left: 600px; position: absolute; 
 
           top: 20px; width: 125px" ForeColor="Red" ControlToValidate="DropDownLocationList" 
 
           ValidationGroup="save" /> 
 
          <asp:Label ID="Label6" runat="server" Style="z-index: 103; left: 10px; position: absolute; 
 
           top: 60px; width: 50px;">Supplier Code</asp:Label> 
 
          <asp:TextBox ID="TextBoxSupCode" runat="server" Width="100px" Style="z-index: 100; 
 
           left: 80px; position: absolute; top: 60px" /> 
 
          <asp:Label ID="Label4" runat="server" Style="z-index: 103; left: 200px; position: absolute; 
 
           top: 60px; width: 95px;">Supplier Name</asp:Label> 
 
          <asp:TextBox ID="TextBoxSupplierName" runat="server" Style="z-index: 100; left: 300px; 
 
           position: absolute; top: 60px; width: 300px;" /> 
 
          <asp:ImageButton ID="ImageFindSupplier" runat="server" Style="z-index: 103; left: 625px; 
 
           position: absolute; top: 60px; width: 25px; height: 25px;" ImageUrl="~/Images/Find.gif" 
 
           CommandName="MainSearch" OnCommand="ImageFindSupplier_Command" /> 
 
          
 
          
 
          <asp:Label ID="Label9" runat="server" Style="z-index: 103; left: 10px; position: absolute; 
 
           top: 100px; width: 50px;">Address</asp:Label> 
 
          <asp:TextBox ID="TextBoxAddress" runat="server" Style="z-index: 100; left: 80px; 
 
           position: absolute; top: 100px; width: 550px;" /> 
 

 
          <asp:Label ID="Label8" runat="server" Style="z-index: 103; left: 10px; position: absolute; 
 
           top: 140px; width: 50px;">Invoice Date</asp:Label> 
 
          <asp:TextBox ID="TextBoxInvoiceDate" runat="server" Style="z-index: 100; left: 80px; 
 
           position: absolute; top: 140px; width: 100px; right: 520px;" /> 
 
          <asp:CalendarExtender ID="TextBoxInvoiceDate_CalendarExtender" runat="server" 
 
           Enabled="True" TargetControlID="TextBoxInvoiceDate"> 
 
          </asp:CalendarExtender> 
 

 
          <asp:Label ID="Label18" runat="server" Style="z-index: 103; left: 200px; position: absolute; 
 
           top: 140px; width: 50px;">Delivery Date</asp:Label> 
 
            <asp:TextBox ID="TextBoxDeliveryDate" runat="server" Style="z-index: 100; left: 300px; 
 
           position: absolute; top: 140px; width: 100px; right: 520px;" /> 
 
          
 
          <asp:CalendarExtender ID="TextBoxDeliveryDate_CalendarExtender" runat="server" 
 
           Enabled="True" TargetControlID="TextBoxDeliveryDate"> 
 
          </asp:CalendarExtender> 
 
          
 
          <asp:Label ID="Label10" runat="server" Style="z-index: 103; left: 10px; position: absolute; 
 
           top: 180px; width: 50px;">Comment</asp:Label> 
 
          <asp:TextBox ID="TextBoxComment" runat="server" Style="z-index: 100; left: 80px; 
 
           position: absolute; top: 180px; width: 550px;" TextMode="MultiLine" Rows="2" /> 
 
          <%-- <asp:Button ID="ButtonSave" runat="server" Text="Save" Style="z-index: 100; left: 50px; 
 
position: relative; top: 250px" Width="50px" ValidationGroup="save"/>--%> 
 
          <%-- <asp:Button ID="ButtonSave" runat="server" Text="Save" Style="z-index: 100; left: 50px; 
 
position: absolute; top: 250px" Width="50px" ValidationGroup="save"/>--%> 
 
         </div> 
 
        </asp:View> 
 
        <asp:View ID="View2" runat="server"> 
 
         <div style="border-style: solid; border-width: 1px; border-color: inherit; z-index: 100; 
 
          left: 1px; width: 725px; position: relative; top: 1px; height: 250px;">              
 
           <asp:Label ID="Label7" runat="server" Style="z-index: 103; left: 10px; position: absolute; 
 
            top: 20px; width: 100px; right: 615px;">Supplier Code</asp:Label> 
 
           <asp:TextBox ID="TextBoxSupplierCode" runat="server" Width="100px" Style="z-index: 100; 
 
            left: 125px; position: absolute; top: 20px" /> 
 
           <asp:Label ID="Label5" runat="server" Style="z-index: 103; left: 315px; position: absolute; 
 
            top: 20px; width: 100px;">Supplier Name</asp:Label> 
 
           <asp:TextBox ID="TextBoxSupp_Name" runat="server" Style="z-index: 100; left: 420px; 
 
            position: absolute; top: 20px; width: 250px;" /> 
 
           <asp:ImageButton ID="ImageButtonSupSearch" runat="server" Style="z-index: 103; left: 675px; 
 
            position: absolute; top: 20px; width: 25px;" ImageUrl="~/Images/Find.gif" OnClick="ImageButtonSupSearch_Click" 
 
            CommandName="SubSearch" TabIndex="1" /> 
 
           <asp:ImageButton ID="ImageButtonClose" runat="server" Style="z-index: 103; left: 700px; 
 
            position: absolute; top: 1px; height: 15px;" ImageUrl="~/Images/close.gif" CommandName="closeSearch" 
 
            OnCommand="ImageButtonClose_Command" /> 
 
          <asp:UpdatePanel ID="updatepnlSupplier" runat="server" UpdateMode="Conditional"> 
 
          <ContentTemplate> 
 
           <asp:GridView ID="GridViewSupplier" runat="server" AllowPaging="True" AutoGenerateColumns="False" 
 
            SkinID="GridView" Style="z-index: 111; left: 175px; position: absolute; top: 50px" 
 
            Width="317px" ShowFooter="True" PageSize="5" DataKeyNames="supplierID" OnPageIndexChanging="GridViewSupplier_PageIndexChanging" 
 
            OnSelectedIndexChanged="GridViewSupplier_SelectedIndexChanged"> 
 
            <columns> 
 
            <%--<asp:HyperLinkField DataNavigateUrlFields="supplierID" runat="server" DataNavigateUrlFormatString="PurchaseOrder.aspx?supplierID={0}" 
 
Text="Select" />--%> 
 
            <asp:CommandField ButtonType="Link" ShowSelectButton="True"> 
 
             <ItemStyle Width="50px" HorizontalAlign="Center" VerticalAlign="Middle"></ItemStyle> 
 
            </asp:CommandField> 
 
            <asp:TemplateField HeaderText="Supplier ID" Visible="false"> 
 
             <ItemTemplate> 
 
              <%# Eval("supplierID")%> 
 
             </ItemTemplate> 
 
            </asp:TemplateField> 
 
            <asp:TemplateField HeaderText="Supplier Name"> 
 
             <ItemTemplate> 
 
              <%# Eval("supplierName")%> 
 
             </ItemTemplate> 
 
            </asp:TemplateField> 
 
            <asp:TemplateField HeaderText="Contact No"> 
 
             <ItemTemplate> 
 
              <%# Eval("supplierContactNo")%> 
 
             </ItemTemplate> 
 
            </asp:TemplateField> 
 
            <asp:TemplateField HeaderText="Email"> 
 
             <ItemTemplate> 
 
              <%# Eval("supplierEmail")%> 
 
             </ItemTemplate> 
 
            </asp:TemplateField> 
 
            <asp:TemplateField HeaderText=""> 
 
             <ItemTemplate> 
 
              <asp:CheckBox runat="server" ID="chbRL" Text="" Checked='<%# Eval("active")%> ' /> 
 
             </ItemTemplate> 
 
            </asp:TemplateField> 
 
           </columns> 
 
           </asp:GridView>         
 
           </ContentTemplate> 
 
           </asp:UpdatePanel> 
 
         </div> 
 
        </asp:View> 
 
       </asp:MultiView> 
 
       <asp:MultiView ID="MultiViewItem" runat="server"> 
 
        <asp:View ID="View3" runat="server"> 
 
         <div style="z-index: 100; left: 1px; width: 725px; position: relative; top: 5px; 
 
          height: 250px;"> 
 
          <asp:Label ID="Label11" runat="server" Style="z-index: 103; left: 10px; position: absolute; 
 
           top: 20px; width: 100px;">Item Code</asp:Label> 
 
          <asp:TextBox ID="TextBoxItemCode" runat="server" Width="100px" Style="z-index: 100; 
 
           left: 125px; position: absolute; top: 20px" /> 
 
          
 
          <asp:Label ID="Label12" runat="server" Style="z-index: 103; left: 315px; position: absolute; 
 
           top: 20px; width: 100px;">Item Name</asp:Label> 
 
          <asp:TextBox ID="TextBoxItemName" runat="server" Style="z-index: 100; left: 420px; 
 
           position: absolute; top: 20px; width: 250px;" /> 
 
          <asp:ImageButton ID="ImageButtonFindItem" runat="server" Style="z-index: 103; left: 675px; 
 
           position: absolute; top: 20px; width: 25px;" ImageUrl="~/Images/Find.gif" CommandName="SubSearchItem" 
 
           TabIndex="1" OnCommand="ImageButtonFindItem_Command" /> 
 
          <asp:Label ID="Label15" runat="server" Style="z-index: 103; left: 10px; position: absolute; 
 
           top: 50px; width: 100px;">UOM</asp:Label> 
 
          <%-- <asp:TextBox ID="TextBoxUOM" runat="server" Width="100px" Style="z-index: 100; left: 125px; 
 
           position: absolute; top: 50px" />--%> 
 
           <asp:DropDownList ID="DropDownListUOM" runat="server" Style="z-index: 100; left: 125px; 
 
           position: absolute; top: 50px" Width="109px" /> 
 
          <asp:Label ID="Label16" runat="server" Style="z-index: 103; left: 235px; position: absolute; 
 
           top: 50px; width: 50px;">Quantity</asp:Label> 
 
          <asp:TextBox ID="TextBoxQty" runat="server" Width="100px" Style="z-index: 100; left: 300px; 
 
           position: absolute; top: 50px" /> 
 
          <asp:Label ID="Label17" runat="server" Style="z-index: 103; left: 420px; position: absolute; 
 
           top: 50px; width: 50px;">Price</asp:Label> 
 
          <asp:TextBox ID="TextBoxPrice" runat="server" Width="100px" Style="z-index: 100; 
 
           left: 475px; position: absolute; top: 50px" /> 
 
          <asp:ImageButton ID="ImageButtonAddItem" runat="server" Style="z-index: 103; left: 675px; 
 
           position: absolute; top: 50px; width: 25px; height: 25px" ImageUrl="~/Images/smallnew.gif" 
 
           CommandName="AddItem" OnClick="ImageButtonAddItem_Click" CausesValidation="true"/> 
 
          <asp:GridView ID="GridViewPurchaseOrder" runat="server" AutoGenerateColumns="False" 
 
           SkinID="GridView" Style="z-index: 111; left: 175px; position: absolute; top: 80px" 
 
           Width="317px" ShowFooter="True" PageSize="2" 
 
           onrowdeleting="GridViewPurchaseOrder_RowDeleting"> 
 
           <Columns> 
 
            <asp:CommandField ShowDeleteButton="True"> 
 
             <ItemStyle Width="50px" HorizontalAlign="Center" VerticalAlign="Middle"></ItemStyle> 
 
            </asp:CommandField> 
 
            <asp:CommandField ButtonType="Link" ShowSelectButton="True"> 
 
             <ItemStyle Width="50px" HorizontalAlign="Center" VerticalAlign="Middle"></ItemStyle> 
 
            </asp:CommandField> 
 
            <asp:TemplateField HeaderText="Item ID" Visible="false"> 
 
             <ItemTemplate> 
 
              <%# Eval("ItemDetail.itemID")%> 
 
             </ItemTemplate> 
 
            </asp:TemplateField> 
 
            <asp:TemplateField HeaderText="Item Name"> 
 
             <ItemTemplate> 
 
              <%# Eval("ItemDetail.ItemDesc")%> 
 
             </ItemTemplate> 
 
            </asp:TemplateField> 
 
            <asp:TemplateField HeaderText="Item Sales Price"> 
 
             <ItemTemplate> 
 
              <%# DataBinder.Eval(Container.DataItem, "ItemDetail.itemSalesPrice", "{0,0:0.00}")%> 
 
             </ItemTemplate> 
 
            </asp:TemplateField> 
 
            <asp:TemplateField HeaderText="UOM"> 
 
             <ItemTemplate> 
 
              <%# Eval("ItemUOM")%> 
 
             </ItemTemplate> 
 
            </asp:TemplateField> 
 
            <asp:TemplateField HeaderText="Quantity"> 
 
             <ItemTemplate> 
 
              <%# Eval("POQty")%> 
 
             </ItemTemplate> 
 
            </asp:TemplateField> 
 
            
 
            <%-- <asp:TemplateField HeaderText=""> 
 
             <ItemTemplate> 
 
              <asp:CheckBox runat="server" ID="chbRL" Text="" Checked='<%# Eval("active")%> ' /> 
 
             </ItemTemplate> 
 
            </asp:TemplateField>--%> 
 
           </Columns> 
 
          </asp:GridView> 
 
          <asp:Button ID="ButtonSave" runat="server" Text="Save" Style="z-index: 100; left: 170px; 
 
       position: absolute; top: 275px; height: 26px;" Width="50px" ValidationGroup="save" 
 
       OnClick="ButtonSave_Click" /> 
 
      <asp:Button ID="ButtonUpdate" runat="server" Text="Update" Style="z-index: 100; left: 230px; 
 
       position: absolute; top: 275px" Width="60px" ValidationGroup="save" OnClick="ButtonUpdate_Click" /> 
 
      <asp:Button ID="ButtonRest" runat="server" Text="Reset" Style="z-index: 100; left: 300px; 
 
       position: absolute; top: 275px; height: 26px;" Width="50px" OnClick="ButtonRest_Click" /> 
 
      <asp:Button ID="ButtonCancel" runat="server" Text="Cancel" Style="z-index: 100; left: 360px; 
 
       position: absolute; top: 275px" Width="50px" OnClick="ButtonCancel_Click" /> 
 
      <asp:Label ID="lblMsg" runat="server" Style="z-index: 103; left: 180px; position: absolute; 
 
       top: 250px; width: 325px; right: 431px;" Font-Bold="True" ForeColor="Blue"></asp:Label> 
 
         </div> 
 
        </asp:View> 
 
        <asp:View ID="View4" runat="server"> 
 
         <div style="border-style: solid; border-width: 1px; border-color: inherit; z-index: 100; 
 
          left: 1px; width: 725px; position: relative; top: 5px; height: 250px;"> 
 
          <asp:Label ID="Label13" runat="server" Style="z-index: 103; left: 10px; position: absolute; 
 
           top: 20px; width: 100px;">Item Code</asp:Label> 
 
          <asp:TextBox ID="TextBoxSearchItemCode" runat="server" Width="100px" Style="z-index: 100; 
 
           left: 125px; position: absolute; top: 20px" /> 
 
          <asp:Label ID="Label14" runat="server" Style="z-index: 103; left: 315px; position: absolute; 
 
           top: 20px; width: 100px;">Item Name</asp:Label> 
 
          <asp:TextBox ID="TextBoxSearchItemName" runat="server" Style="z-index: 100; left: 420px; 
 
           position: absolute; top: 20px; width: 250px;" /> 
 
          <asp:ImageButton ID="ImageButtonIt_Search" runat="server" Style="z-index: 103; left: 675px; 
 
           position: absolute; top: 20px; width: 25px;" ImageUrl="~/Images/Find.gif" CommandName="SubSearchItem" 
 
           TabIndex="1" OnClick="ImageButtonIt_Search_Click" /> 
 
          <asp:ImageButton ID="ImageButtonItemClose" runat="server" Style="z-index: 103; left: 700px; 
 
           position: absolute; top: 1px; height: 15px;" ImageUrl="~/Images/close.gif" CommandName="closeItSearch" 
 
           OnCommand="ImageButtonItemClose_Command" /> 
 
          <asp:GridView ID="GridViewItem" runat="server" AllowPaging="True" AutoGenerateColumns="False" 
 
           SkinID="GridView" Style="z-index: 111; left: 175px; position: absolute; top: 50px" 
 
           Width="317px" ShowFooter="True" PageSize="5" DataKeyNames="itemID" OnPageIndexChanging="GridViewItem_PageIndexChanging" 
 
           OnSelectedIndexChanged="GridViewItem_SelectedIndexChanged"> 
 
           <Columns> 
 
            <asp:CommandField ButtonType="Link" ShowSelectButton="True"> 
 
             <ItemStyle Width="50px" HorizontalAlign="Center" VerticalAlign="Middle"></ItemStyle> 
 
            </asp:CommandField> 
 
            <asp:TemplateField HeaderText="Item ID" Visible="false"> 
 
             <ItemTemplate> 
 
              <%# Eval("itemID")%> 
 
             </ItemTemplate> 
 
            </asp:TemplateField> 
 
            <asp:TemplateField HeaderText="Item Name"> 
 
             <ItemTemplate> 
 
              <%# Eval("ItemDesc")%> 
 
             </ItemTemplate> 
 
            </asp:TemplateField> 
 
            <asp:TemplateField HeaderText="Item Category Name"> 
 
             <ItemTemplate> 
 
              <%# Eval("ItemCategory.itemCatName")%> 
 
             </ItemTemplate> 
 
            </asp:TemplateField> 
 
            <asp:TemplateField HeaderText="Item Sales Price"> 
 
             <ItemTemplate> 
 
              <%# DataBinder.Eval(Container.DataItem, "itemSalesPrice", "{0,0:0.00}")%> 
 
             </ItemTemplate> 
 
            </asp:TemplateField> 
 
            <asp:TemplateField HeaderText="Reorder Level"> 
 
             <ItemTemplate> 
 
              <%# Eval("itemReorder")%> 
 
             </ItemTemplate> 
 
            </asp:TemplateField> 
 
            <asp:TemplateField HeaderText="Item Cost Price"> 
 
             <ItemTemplate> 
 
              <%# DataBinder.Eval(Container.DataItem, "itemCostPrice", "{0,0:0.00}")%> 
 
             </ItemTemplate> 
 
            </asp:TemplateField> 
 
            <asp:TemplateField HeaderText=""> 
 
             <ItemTemplate> 
 
              <asp:CheckBox runat="server" ID="chbRL" Text="" Checked='<%# Eval("active")%> ' /> 
 
             </ItemTemplate> 
 
            </asp:TemplateField> 
 
           </Columns> 
 
          </asp:GridView> 
 
         </div> 
 
        </asp:View> 
 
       </asp:MultiView> 
 
      </ContentTemplate> 
 
     </asp:UpdatePanel> 
 
    </div> 
 
</asp:Content>

擊中需要一些指導

來源

2015-10-17 Sanjeewa

當ImageButton的被點擊頁面驗證。你一定在做錯事。粘貼HTML也。 – Sandeep

@sanjeewa你可以發佈頁面加載代碼 – Webruster

我們的代碼在更新面板「upnlSerachSupplier」之外。你必須使用更新面板周圍的標籤如下：

<asp:UpdatePanel runat="server" ID="upnl1" UpdateMode="Always"> 
    <ContentTemplate> 
<asp:Label ID="labelerror" runat="server" Text="Error" CssClass="errorLabel" 
      EnableViewState="False"></asp:Label> 
    <ContentTemplate> 
</asp:UpdatePanel>

在請看：執行

https://msdn.microsoft.com/en-us/library/system.web.ui.updatepanel.updatemode(v=vs.110).aspx

來源

2015-10-17 05:27:21 Sandeep

似乎你是對的，我也必須檢查其他功能。 – Sanjeewa

我覺得你可以做這樣的事情...添加斷點並檢查它是否進入其他部分

protected void ImageButtonAddItem_Click(object sender, ImageClickEventArgs e) 
    { 
     if (TextBoxItemCode.Text == "") 
     { 
      labelerror.Text = "Please select an item to Add ."; 
     } 
     else 
     { 
      poDetails.Add(
          new PurchaseOrderDetail 
           { 
            ItemDetail = new ItemService().GetItemByID(Convert.ToInt32(TextBoxItemCode.Text.Trim())), 
            POQty = Convert.ToInt32(TextBoxQty.Text), 
            ItemUOM = DropDownListUOM.SelectedItem.Text, 
            ActiveStatus = true 
           } 
         ); 

     GridViewPurchaseOrder.DataSource = poDetails; 
     GridViewPurchaseOrder.DataBind(); 
     } 
    }

烏爾頁面加載其他部分刷新烏爾標籤錯誤，這部分..

  else 
      { 
      labelerror.Text = ""; 
      LockControls(true); 
      }

更好u使用不同的標籤爲，或因爲你寫的標籤裏面

protected void Page_Load(object sender, EventArgs e) 
    { 
if(!IsPostBack) 
{ 
//all ur page load code 
} 
}

來源

2015-10-17 04:35:32

你是否在你的代碼中的任何其他地方使用過labelerror.Text？ –

@ Webruster我已經更新我的頁面加載事件代碼.. @Anirudh是的，我已經在頁面加載 – Sanjeewa

使用的標籤，因爲它刷新烏爾labelerror.Text –

的ASP.NET圖像按鈕確認

回答

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