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Example E4552
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Upload Control for ASP.NET Web Forms - How to limit the number of uploaded files

When the EnableMultiSelect property is set to true, ASPxUploadControl allows users to choose multiple files to upload in a single open file dialog. This example demonstrates how to limit the number of files that a user can upload at once.

Files to Review

Documentation

Example Code

WebSite/Default.aspx 
ASPx
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>

<%@ Register Assembly="DevExpress.Web.v13.1, Version=13.1.14.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a" Namespace="DevExpress.Web" TagPrefix="dx" %>



<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>How to limit the number of uploaded files</title>
    <style type="text/css">
        .groupBox
        {
            width: 319px;
            height: 206px;
        }
    </style>
</head>
<body>
    <script type="text/javascript">
        var filesNumber;
        var msg = 'Too many files';
        function textChanged(s, e) {
            filesNumber = upload1.GetText().split(',').length;
            if (filesNumber > spinEdit.GetValue())
                alert(msg);
        }
        function uploadStart(s, e) {
            if (filesNumber > spinEdit.GetValue()) {
                alert(msg);
                e.cancel = true;
            }
        }
        function fileUploadComplete(s, e) {
            if (e.callbackData != "")
                addFileToContainer(e.callbackData);
        }
        function addFileToContainer(callbackData) {
            var label = document.createElement('label');
            label.innerText = callbackData;
            var fileContainer = document.getElementById("groupBox1");
            fileContainer.appendChild(label);
            fileContainer.appendChild(document.createElement('br'));
        }
    </script>
    <form id="form1" runat="server">
        <div>
            <dx:ASPxSpinEdit ID="ASPxSpinEdit1" runat="server" Number="5" Height="19px" ClientInstanceName="spinEdit" HelpText="Files count" Width="86px" />
            <dx:ASPxUploadControl ID="ASPxUploadControl1" runat="server" Width="280px"
                ShowAddRemoveButtons="true" ShowUploadButton="true" ShowProgressPanel="true" ClientInstanceName="upload1" OnFileUploadComplete="ASPxUploadControl1_FileUploadComplete">
                <ClientSideEvents TextChanged="textChanged" FileUploadStart="uploadStart" FileUploadComplete="fileUploadComplete" />
                <ValidationSettings MaxFileSize="4000000"></ValidationSettings>
                <AdvancedModeSettings EnableMultiSelect="true" />
            </dx:ASPxUploadControl>
            <br />
            <fieldset class="groupBox" id="groupBox1">
                <legend>Uploaded Files</legend>
            </fieldset>
        </div>
    </form>
</body>
</html>

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