The connection name 'xxx' was not found in the applications configuration...

Full error message:

Server Error in '/' Application.
--------------------------------------------------------------------------------

The connection name 'ConnectionString_CWDW_Retail' was not found in the applications configuration or the connection string is empty. 
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. 

Exception Details: System.InvalidOperationException: The connection name 'ConnectionString_CWDW_Retail' was not found in the applications configuration or the connection string is empty.

Source Error: 


Line 152:                            </asp:GridView>
Line 153:
Line 154:                            <asp:SqlDataSource ID="DataSource_CWDW_Retail" runat="server" 
Line 155:                                ConnectionString="<%$ ConnectionStrings:ConnectionString_CWDW_Retail %>" 
Line 156:                                ProviderName="<%$ ConnectionStrings:ConnectionString_CWDW_Retail.ProviderName %>"                                 
 

Source File: C:\inetpub\wwwroot\Retail_Reports.aspx    Line: 154 

Stack Trace: 


[InvalidOperationException: The connection name 'ConnectionString_CWDW_Retail' was not found in the applications configuration or the connection string is empty.]
   System.Web.Compilation.ConnectionStringsExpressionBuilder.GetConnectionString(String connectionStringName) +4400005
   ASP.retail_reports_aspx.__BuildControlDataSource_CWDW_Retail() in C:\inetpub\wwwroot\Retail_Reports.aspx:154
   ASP.retail_reports_aspx.__BuildControlpnlRecipients() in C:\inetpub\wwwroot\Retail_Reports.aspx:83
   ASP.retail_reports_aspx.__BuildControl__control4(Control __ctrl) in C:\inetpub\wwwroot\Retail_Reports.aspx:28
   AjaxControlToolkit.TabPanel.OnInit(EventArgs e) in d:\hg\act\Server\AjaxControlToolkit\Tabs\TabPanel.cs:185
   System.Web.UI.Control.InitRecursive(Control namingContainer) +133
   System.Web.UI.Control.InitRecursive(Control namingContainer) +421
   System.Web.UI.Control.InitRecursive(Control namingContainer) +421
   System.Web.UI.Control.InitRecursive(Control namingContainer) +421
   System.Web.UI.Control.InitRecursive(Control namingContainer) +421
   System.Web.UI.Control.InitRecursive(Control namingContainer) +421
   System.Web.UI.Control.InitRecursive(Control namingContainer) +421
   System.Web.UI.Control.InitRecursive(Control namingContainer) +421
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1954
--------------------------------------------------------------------------------
Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.1 



=========================================================================
copy of Web.config file
=========================================================================

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

  <connectionStrings>
    <add name="ConnectionString_CWDW_Retail" connectionString="Provider=SQLOLEDB;Data Source=TTA-CWDW;Integrated Security=SSPI;Initial Catalog=Retail"
      providerName="System.Data.OleDb" />
  </connectionStrings>

  <system.web>
    <!-- 
            Visual Basic options:
            Set strict="true" to disallow all data type conversions 
            where data loss can occur. 
            Set explicit="true" to force declaration of all variables.
        -->
    <compilation debug="true" strict="true" explicit="true" targetFramework="4.0">
      <assemblies>
        <add assembly="System.Web.Routing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
        <add assembly="System.DirectoryServices.AccountManagement, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
        <add assembly="System.Design, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>
        <add assembly="System.Web.Extensions.Design, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
        <add assembly="System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
      </assemblies>
    </compilation>
    <!--
          The <authentication> section enables configuration 
          of the security authentication mode used by 
          ASP.NET to identify an incoming user. 
        -->
    <authentication mode="Windows"/>
    <!--
           The <customErrors> section enables configuration 
           of what to do if/when an unhandled error occurs 
           during the execution of a request. Specifically, 
           it enables developers to configure html error pages 
           to be displayed in place of a error stack trace.

           <customErrors mode="RemoteOnly" defaultRedirect="GenericErrorPage.htm">
             <error statusCode="403" redirect="NoAccess.htm" />
             <error statusCode="404" redirect="FileNotFound.htm" />
           </customErrors>
        -->
    <pages controlRenderingCompatibilityVersion="3.5" clientIDMode="AutoID">
      <namespaces>
        <clear/>
        <add namespace="System"/>
        <add namespace="System.Collections"/>
        <add namespace="System.Collections.Generic"/>
        <add namespace="System.Collections.Specialized"/>
        <add namespace="System.Configuration"/>
        <add namespace="System.Text"/>
        <add namespace="System.Text.RegularExpressions"/>
        <add namespace="System.Linq"/>
        <add namespace="System.Xml.Linq"/>
        <add namespace="System.Web"/>
        <add namespace="System.Web.Caching"/>
        <add namespace="System.Web.SessionState"/>
        <add namespace="System.Web.Security"/>
        <add namespace="System.Web.Profile"/>
        <add namespace="System.Web.UI"/>
        <add namespace="System.Web.UI.WebControls"/>
        <add namespace="System.Web.UI.WebControls.WebParts"/>
        <add namespace="System.Web.UI.HtmlControls"/>
      </namespaces>
    </pages>
  </system.web>
  <!-- 
        The system.webServer section is required for running ASP.NET AJAX under Internet
        Information Services 7.0.  It is not necessary for previous version of IIS.
    -->
</configuration>

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