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Custom Http Handler

Telerik ASP.NET Async Upload control relies on an Http handler to upload files and performs the uploads by dividing the files in chunks and saving them in a temporary folder.

This demo shows how you can inherit and extend the default Http handler to create a custom one which allows you to save files directly to a database instead of a temporary folder.

For our demo purposes we have set two handlers: one saving your file to the database and returning the database record identifier, and another retrieving the uploaded image from the database in order for it to be visualized.

  • DefaultVB.aspx
  • DefaultVB.aspx.vb
    • DefaultVB.aspx.vb
    • Handler.ashx.vb
    • SampleAsyncUploadConfiguration.vb
    • SampleAsyncUploadResult.vb
    • StreamImage.ashx.vb
  • scripts.js
  • styles.css
<%@ Page Language="VB" AutoEventWireup="true" CodeFile="DefaultVB.aspx.vb" Inherits="Upload_ImageUploader_DefaultVB" %>

<!DOCTYPE html>
<html xmlns=''>
<head runat="server">
    <title>Telerik ASP.NET Example</title>
    <link rel="stylesheet" type="text/css" href="styles.css" />
    <script src="scripts.js" type="text/javascript"></script>

    <form id="form1" runat="server">
    <telerik:RadScriptManager runat="server" ID="RadScriptManager1" />
    <telerik:RadSkinManager ID="RadSkinManager1" runat="server" ShowChooser="true" />

    <div class="demo-container size-narrow">
        <p class="info"></p>
        <telerik:RadAsyncUpload RenderMode="Lightweight" runat="server" ID="RadAsyncUpload1" HttpHandlerUrl="~/AsyncUpload/Examples/ImageUploader/Handler.ashx"
            OnClientFileUploaded="fileUploaded" OnClientFileUploadRemoving="fileUploadRemoving" 
            MultipleFileSelection="Disabled" AllowedFileExtensions="jpeg,jpg,gif,png,bmp" Width="500px" />
        <div class="imageContainer"></div>

    <script type="text/javascript">
        Sys.Application.add_load(function () {


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