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Editorial Team
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Asked: 2026-05-16T15:23:24+00:00

I’ve been looking for this answer, and all I found was this link ,

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I’ve been looking for this answer, and all I found was this link, but when I attempted to follow the tutorial I failed hard. What I need is to connect my Silverlight application to a database, just to show informations from a specific table. As I don’t want to use the same ORM for my page and my silverlight app, I created a new WCF webservice project, and created my LINQ to SQL classes inside of it.

I tested my WCF service and it works fine, but somehow my Silverlight App doesnt reach it. I’ve changed the web.config file, and now it looks as follows.

My web.config 

<?xml version="1.0"?> <configuration>

  <connectionStrings>
    <add name="bd_webportosConnectionString" connectionString="Data Source=BARNEY\DEV;Initial Catalog=bd_webportos;User ID=sa;Password=Stigeo_1_adm_1"
      providerName="System.Data.SqlClient" />   </connectionStrings>   <system.web>
    <compilation debug="true" targetFramework="4.0" />   </system.web>   <system.serviceModel>
    <bindings>
      <basicHttpBinding>
        <binding name="basicHttpBindingConfig">
          <security mode="TransportCredentialOnly">
            <transport clientCredentialType="Ntlm"/>
          </security>
        </binding>
      </basicHttpBinding>
    </bindings>
    <client>
      <endpoint address="http://localhost:7298/DataToSilverlight.svc"
          binding="basicHttpBinding" bindingConfiguration="BasicHttpBinding_IService1"
          contract="DataRetrieverReference.IService1" name="BasicHttpBinding_IService1" />
    </client>
    <behaviors>
      <serviceBehaviors>
        <behavior>
          <!-- To avoid disclosing metadata information, set the value below to false and remove the metadata endpoint above before deployment -->
          <serviceMetadata httpGetEnabled="true"/>
          <!-- To receive exception details in faults for debugging purposes, set the value below to true. Set to false before deployment to avoid disclosing exception information
-->
          <serviceDebug includeExceptionDetailInFaults="false"/>
        </behavior>
      </serviceBehaviors>
    </behaviors>
    <serviceHostingEnvironment multipleSiteBindingsEnabled="true" />  </system.serviceModel>  <system.webServer>
    <modules runAllManagedModulesForAllRequests="true"/> </system.webServer>    </configuration>

I don’t know how to solve this problem. And although I got stuck, I tried to keep going forward, but then I got stuck again in the next step, that was to add the service reference to my silverlight app. As I try to do what it says, the following message is shown:

There was an error downloading
metadata from the address. Please
verify that you have entered a valid
address.

I tested the service through WCF Test Client, and it worked, but my silverlight app doesn’t reach it. I get the following exception:

An error occurred while trying to make
a request to URI
‘http://localhost:7298/DataToSilverlight.svc‘.
This could be due to attempting to
access a service in a cross-domain way
without a proper cross-domain policy
in place, or a policy that is
unsuitable for SOAP services. You may
need to contact the owner of the
service to publish a cross-domain
policy file and to ensure it allows
SOAP-related HTTP headers to be sent.
This error may also be caused by using
internal types in the web service
proxy without using the
InternalsVisibleToAttribute attribute.
Please see the inner exception for
more details.

Can you guys help me solving this big problem, or even showing another way to achieve what I want?

I also recently discovered that my crossdomain.xml doesn’t get loaded … but I don’t know what that means.

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1 Answer

  1. Editorial Team

    According to MSDN the <services> tag should be inside your <system.serviceModel> tag. Just copy the whole block in there.

    Edit: About the connect to database part.

    Silverlight can not magically “query” the database through the WCF service unless you create a WCF Data Service/OData. To get data from the database to your Silverlight client in a straight forward way you need to create methods in the WCF service that queries the database according to the in-parameters of the WCF method, packs it up i a suitable data structure (List<Customer> in the example in you link) and returns the result to the Silverlight client.

    The error you get “There was an error downloading metadata from the address. Please verify that you have entered a valid address.” is not an error relevant to the database, it is an error telling that your WCF service can not be found. That would have happened regardless if your WCF service used a database or not.

    It looks like there might be further configuration errors in the WCF service, that might explain why the reference to the service can not be added. How does your dialog corresponding to “Figure 3-13. Adding a reference to the Web Service” look like? You can edit your question and insert a screen dump.

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