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Silverlight 4 Hosting - ASPHostPortal :: Clean Up Your Broken Silverlight Installation

clock November 24, 2010 11:54 by author Jervis

If Silverlight isn't working for you and you are getting errors trying to either uninstall, reinstall or upgrade Silverlight the steps below might help you. Note that I'm not listing all the steps to remove every trace of Silverlight from your machine. These steps are just meant to clean up enough so that future attempts to install, upgrade or uninstall don't fail.

Standard warnings about editing your registry apply. Be careful that you only delete what I say to delete below. If you delete too much by accident it is quite likely that you will break something and there is no way to undo accidental changes.

Steps to clean up a machine to fix a broken Silverlight installation:

- In the Control Panel, open the Add/Remove Programs applet (Programs on Vista) and uninstall Microsoft Silverlight if it is shown as installed by clicking on it and then clicking Uninstall or Remove. If you get an error on this step (for example a dialog saying that the msi file cannot be found), just continue on to the next step

- Using regedit, navigate to HKLM\Software\Microsoft\Silverlight and delete the key.
From an administrator command shell you can do this by running:
reg delete HKLM\Software\Microsoft\Silverlight /f

- Using Windows Explorer, delete the “Microsoft Silverlight” directory from under Program Files.
From an administrator command shell on an x86 you can do this by running:
rmdir /s /q "%ProgramFiles%\Microsoft Silverlight

If you are on a 64-bit version of Windows, substitute ProgramFiles(x86):
rmdir /s /q "%ProgramFiles(x86)%\Microsoft Silverlight


If you have any problem with your Silverlight, you can host your site with us. You can only need to spend $5.00/month to get professional Silverlight hosting.

Silverlight 4 Hosting - ASPHostPortal :: How to solve Unhandled Error in Silverlight Application Code: 2104

clock November 16, 2010 07:17 by author Jervis


You ftp a Silverlight App to an IIS website, go to the website in a browser, and get the following error:

Message: Unhandled Error in Silverlight Application
Code: 2104
Category: InitializeError
Message: Could not download the Silverlight application. Check web server settings


The Silverlight Mime types (.xaml, .xap and .xbap) are not listed in that websites registered mime types, therefore IIS will not send those files to the browser.


Open IIS on the server, go to HTTP headers, click on Mime Types, click “Add New” and add the following:

Extension – Mime Type
.xaml – application/xaml+xml
.xap – application/x-silverlight-app
.xbap – application/x-ms-xbap

Hit Apply and your application will load! OR you can read another post from me,

Hope it helps!!

Silverlight 4 Hosting - ASPHostPortal :: Unhandled Error in Silverlight Application Code: 2104

clock November 16, 2010 06:59 by author Jervis



When you add a Silverlight project to a solution, Visual Studio will ask you if you would like to create new web site to host it, or choose an existing one in your solution.  I choose an existing one.  By default, Visual Studio creates this in your HTML markup to host a Silverlight application:

    <div id="silverlight">

        <object data="data:application/x-silverlight-2," type="application/x-silverlight-2">
          <param name="source" value="ClientBin/MySilverlightApp.xap"/>
          <param name="onError" value="onSilverlightError" />
          <param name="background" value="white" />
          <param name="minRuntimeVersion" value="3.0.40624.0" />
          <param name="autoUpgrade" value="true" />
          <param name="initParams" value="page=UserRegistrationView" />

          <a href="" style="text-decoration:none">
               <img src="" alt="Get Microsoft Silverlight" style="border-style:none"/>


        <iframe id="_sl_historyFrame" style="visibility:hidden;height:0px;width:0px;border:0px"></iframe>

Visual Studio does not account for the URL rewriting that comes with MVC and by default the path to xap file is wrong.  Change the source parameter to be rooted like so:

          <param name="source" value="/ClientBin/MySilverlightApp.xap"/>

Hope this help to solve your problem. J

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Engineers staff our data center 24 hours a day, 7 days a week, 365 days a year to manage the network infrastructure and oversee top-of-the-line servers that host our clients’ critical sites and services.


We’re a company that works differently to most. Value is what we output and help our customers achieve, not how much money we put in the bank. It’s not because we are altruistic. It’s based on an even simpler principle. "Do good things, and good things will come to you".

Success for us is something that is continually experienced, not something that is reached. For us it is all about the experience – more than the journey. Life is a continual experience. We see the Internet as being an incredible amplifier to the experience of life for all of us. It can help humanity come together to explode in knowledge exploration and discussion. It is continual enlightenment of new ideas, experiences, and passions

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