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Custom Control with a "Choose Avatar" control

4 posts, 1 answered
  1. Daniel
    Daniel avatar
    35 posts
    15 Jun 2010
    19 Oct 2010
    Link to this post

    I have a Custom Control where I'm trying to create one of those "Choose Avatar" controls, basically by doing the same that's shown on your example, located at

    If I create a page on the root of my Sitefinity website and use the code available on that example everything works fine, however if I attempt to use it while inside a Custom Control then the Thumbnail ain't updated. The Ajax is called and the FileUpload method of the RadAsyncUpload is also called and the property DataValue of the Thumbnail seems to be updated together with the ImageUrl which points to telerik's handler, however no picture is displayed.

    Below is the current code that I have:

    protected override void InitializeControls(GenericContainer controlContainer)
                AsyncUpload1.FileUploaded += new FileUploadedEventHandler(AsyncUpload1_FileUploaded);
            protected void AsyncUpload1_FileUploaded(object sender, FileUploadedEventArgs e)
                Thumbnail.Width = Unit.Pixel(200);
                Thumbnail.Height = Unit.Pixel(150);
                using (Stream stream = e.File.InputStream)
                    byte[] imageData = new byte[stream.Length];
                    stream.Read(imageData, 0, (int)stream.Length);
                    Thumbnail.DataValue = imageData;
            protected virtual RadAsyncUpload AsyncUpload1
                get { return base.Container.GetControl<RadAsyncUpload>("AsyncUpload1", true); }
            protected virtual RadBinaryImage Thumbnail
                get { return base.Container.GetControl<RadBinaryImage>("Thumbnail", true); }

    <%@ Control Language="C#"%>
    <%@ Register Assembly="Telerik.Sitefinity" Namespace="Telerik.Sitefinity.Web.UI" TagPrefix="sitefinity" %>
    <%@ Register TagPrefix="telerik" Namespace="Telerik.Web.UI" %>
    <sitefinity:ResourceLinks ID="resourcesLinks" runat="server" UseEmbeddedThemes="True">
        <sitefinity:ResourceFile AssemblyInfo="Website.Widgets.TestWidget.TestWidget, Website.Widgets" Name="Website.Widgets.TestWidget.Resources.TestWidget.css" Static="true"/>
        <telerik:RadAjaxManager ID="RadAjaxManagerTest" runat="server">
                <telerik:AjaxSetting AjaxControlID="RadAjaxManagerTest">
                        <telerik:AjaxUpdatedControl ControlID="Thumbnail" />
        <script type="text/javascript">
            function fileUploaded(sender, args) {
                $find('<%= RadAjaxManagerTest.ClientID %>').ajaxRequest();
        <div class="upload-panel">
            <%-- For the purpose of this demo the files are discarded.
                 In order to store the uploaded files permanently set the TargetFolder property to a valid location. --%>
            <telerik:RadBinaryImage runat="server" Width="200px" Height="150px" ResizeMode="Fit"
                ID="Thumbnail" ImageUrl="blank.png" AlternateText="Thumbnail" />
            <telerik:RadAsyncUpload runat="server" ID="AsyncUpload1" MaxFileInputsCount="1" OnClientFileUploaded="fileUploaded"
                <Localization Select="Choose Avatar" />

    Is this a known bug? And if so, is there a solution for this already?

    Thanks in advance,
  2. Ivan Dimitrov
    Ivan Dimitrov avatar
    16072 posts
    12 Sep 2017
    02 Nov 2010
    Link to this post
    Hi Daniel,

    There is a problem with RadAjaxManager, which is null when you make the asynchronous call. We are working on this issue. Unfortunately I am not able to send you a fix, because the issue is not something trivial.

    Kind regards,
    Ivan Dimitrov
    the Telerik team
    Do you want to have your say when we set our development plans? Do you want to know when a feature you care about is added or when a bug fixed? Explore the Telerik Public Issue Tracking system and vote to affect the priority of the items
  3. Kristian
    Kristian avatar
    214 posts
    03 Jun 2010
    18 Mar 2011
    Link to this post
    Is the AjaxManager still having issues since this post?
  4. Hristo Borisov
    Hristo Borisov avatar
    190 posts
    19 Jun 2017
    24 Mar 2011
    Link to this post
    Hello Kristian,

    We will introduce a fix for this with our Q1 release that is around the corner. We have adopted the virtual path provider and have made our own parse obsolete so that there are no issues with the ajax manager. Furthermore we will be delivering User Profiles which feature the avatar functionality.

    Thank you for contacting us.

    Hristo Borisov
    the Telerik team
4 posts, 1 answered