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Example T365088
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dxFileUploader - How to upload files to the server in an ASP.NET Web Forms application

Files to look at:

This example demonstrates how to upload files to the server by using the dxFileUploader widget in an ASP.NET WebForms application. Two approaches are illustrated:

  1. Uploading files by using a custom HTTP Handler.
    2) Uploading files when the form is submitted.

See also:
T365089: dxFileUploader - How to upload files to the server in an ASP.NET MVC application

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Example Code

Upload/Default.aspx 
ASPx
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="Upload.Default" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>

    <link rel="stylesheet" type="text/css" href="http://cdn3.devexpress.com/jslib/15.2.7/css/dx.common.css" />
    <link rel="stylesheet" type="text/css" href="http://cdn3.devexpress.com/jslib/15.2.7/css/dx.light.css" />
    <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/2.1.4/jquery.min.js"></script>
    <script type="text/javascript" src="http://ajax.aspnetcdn.com/ajax/globalize/0.1.1/globalize.min.js"></script>
    <script type="text/javascript" src="http://cdn3.devexpress.com/jslib/15.2.7/js/dx.webappjs.js"></script>
</head>
<body>

    Http Handler Uploading:
    <div id="uploadContainer"></div>

    Form Submit Uploading:
    <form id="form1" enctype="multipart/form-data" runat="server">
        <div id="formUploadContainer"></div>
        <input type="submit" />
    </form>

    <script type="text/javascript">
        $("#uploadContainer").dxFileUploader({
            buttonText: 'Select file',
            labelText: 'Drop file here',
            multiple: true,
            accept: 'image/*',
            uploadUrl: 'http://localhost:62539/Uploader.ashx'
        });

        $("#formUploadContainer").dxFileUploader({
            buttonText: 'Select file',
            labelText: 'Drop file here',
            multiple: true,
            accept: 'image/*',
            uploadMode: 'useForm'
        });
    </script>
</body>
</html>
Upload/Default.aspx.cs(vb) 
C#
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace Upload {
    public partial class Default : System.Web.UI.Page {
        protected void Page_Load(object sender, EventArgs e) {
            if (IsPostBack) {
                SaveFilesHelper.Save(this.Context);
            }
        }
    }
}
Upload/SaveFilesHelper.cs(vb) 
C#
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

namespace Upload {
    public class SaveFilesHelper {
        public static void Save(HttpContext context) {
            try {
                HttpFileCollection files = context.Request.Files;
                HttpRequest request = context.Request;
                if (files.Count != 0) {
                    for (int i = 0; i < files.Count; i++) {
                        HttpPostedFile file = files[i];
                        if (file.ContentLength != 0) {
                            string fileName = string.Empty;
                            if (request.Browser.Browser.Contains("InternetExplorer"))
                                fileName = System.IO.Path.GetFileName(file.FileName);
                            else
                                fileName = file.FileName;
                            string path = context.Server.MapPath("~/Images/") + fileName;
                            file.SaveAs(path);
                        }
                    }
                }
            } catch (Exception ex) {
                context.Response.Write(ex.Message);
            }
        }
    }
}
Upload/UploadHandler.cs(vb) 
C#
using System;
using System.Web;
using System.Web.SessionState;

namespace Upload {
    public class UploadHandler : IHttpHandler {
        public bool IsReusable {
            get { return true; }
        }

        public void ProcessRequest(HttpContext context) {
            SaveFilesHelper.Save(context);
        }
    }
}
Upload/Web.config 
Code
<?xml version="1.0" encoding="utf-8"?>
<configuration>
  <system.web>
    <compilation debug="true" targetFramework="4.7.2" />
    <httpRuntime maxRequestLength="4096" />
    <httpHandlers>
      <add type="Upload.UploadHandler, Upload" path="Uploader.ashx" verb="POST" validate="false" />
    </httpHandlers>
  </system.web>
  <system.webServer>
    <validation validateIntegratedModeConfiguration="false" />
    <handlers>
      <add type="Upload.UploadHandler, Upload" path="Uploader.ashx" verb="POST" name="UploadHandler" preCondition="integratedMode" />
    </handlers>
    <security>
      <requestFiltering>
        <requestLimits maxAllowedContentLength="30000000" />
      </requestFiltering>
    </security>
    <httpProtocol>
      <customHeaders>
        <add name="Access-Control-Allow-Origin" value="*" />
        <add name="Access-Control-Allow-Headers" value="Origin, X-Requested-Width, Content-Type, Accept" />
        <add name="Access-Control-Allow-Methods" value="Get,PUT,POST,DELETE,OPTIONS" />
      </customHeaders>
    </httpProtocol>
  </system.webServer>
</configuration>

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