October 18, 2010 08:16 by
DarwinUpgrade an Application's Web.config File from the .NET Framework 3.5 to the .NET Framework 4
1. Make sure that the application currently targets ASP.NET 3.5.
2. Open the Web.config file in the application root.
3. In the configSections section, remove the sectionGroup element that is named "system.web.extensions".
4. In the system.web section, in the compilation collection, remove every add element that refers to an assembly of the .NET Framework.
Framework assemblies generally begin with "System.". Typically these have Version=3.5.0.0 in the assembly attribute. However, some assembly entries that have the 3.5.0.0 version number might refer to assemblies that were installed as part of add-on releases, or to custom assemblies. Do not delete these. If the Web.config file contains any of these references, you must investigate them individually to determine whether a later version is available and whether the version reference must be changed.
5. Add a targetFramework attribute to the compilation element in the system.web section, as shown in the following example:
<compilation targetFramework="4.0">
In the opening tag for the pages section, add a controlRenderingCompatibility attribute, as shown in the following example:
<pages controlRenderingCompatibilityVersion="3.5"/>
Many ASP.NET 4 controls render HTML that is compliant with XHTML and accessibility standards. However, the Web site that you are converting might have CSS rules or client script that will not work correctly if Web pages change the way they render HTML. If you want to take advantage of the control rendering enhancements in ASP.NET 4, you can omit this attribute.
6. In the system.codedom section, in the compilers collection, remove the compiler elements for c# and vb.
7. Delete everything between the system.webserver section start and end tags, but leave the tags themselves.
8. Delete everything between the runtime section start and end tags, but leave the tags themselves.
9. If you have customized the Web.config file, and if any customizations refer to custom assemblies or classes, make sure that the assemblies or classes are compatible with the .NET Framework version 4.
The following example shows an example Web.config file for a simple Web application that was converted from the .NET Framework version 3.5 to the .NET Framework version 4.
<?xml version="1.0"?>
<!--
Note: As an alternative to hand editing this file you can use the
web admin tool to configure settings for your application. Use
the Website->Asp.Net Configuration option in Visual Studio.
A full list of settings and comments can be found in
machine.config.comments usually located in
\Windows\Microsoft.Net\Framework\v2.x\Config
-->
<configuration>
<appSettings/>
<connectionStrings>
<add name="NorthwindConnection" connectionString="Data Source=.\SQLEXPRESS;AttachDbFilename=|DataDirectory|\NORTHWND.MDF;Integrated Security=True;User Instance=True" providerName="System.Data.SqlClient"/>
</connectionStrings>
<system.web>
<!--
Set compilation debug="true" to insert debugging
symbols into the compiled page. Because this
affects performance, set this value to true only
during development.
-->
<compilation debug="true" targetFramework="4.0">
<assemblies>
</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"/></system.web>
<system.codedom>
</system.codedom>
<!--
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.
-->
<system.webServer>
</system.webServer>
</configuration>
Associate an IIS Application with the .NET Framework 4 in IIS 7.0
1. In Windows, start Inetmgr.
2. In the Connections pane, expand the server node and then click Application Pools.
3. On the Application Pools page, select the application pool that contains the application that you want to change.
4. In the Actions pane, click View Applications.
5. Select the application whose application pool hat you want to change and then click Change Application Pool in the Actions pane.
6. In the Select Application Pool dialog box, select an application pool that is associated with .NET Framework version 4 from the Application pool list, and then click OK.
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