How can I convert .NET 4.0 to 3.5 in my project ?!

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I want to convert my project (it uses .NET 4.0) to .NET 3.5. How can I do this in Visual Studio 2010 ?!

Posted 4-Dec-12 6:22am

mahmii

Updated 4-Dec-12 6:48am

Smitha Nishant

v3

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DamithSL 4-Dec-12 12:31pm

http://msdn.microsoft.com/en-us/library/bb398202.aspx

Richard C Bishop 4-Dec-12 12:33pm

I don't think you can really convert it as they are the same thing, one just has newer capabilities. You can either change the target framework or in IIS you can change the application pool to use one or the other.

3 solutions

Solution 3

http://www.bnettechnologies.com/BnetBlog/post/2010/11/01/Target-Framework-Net-Framework-40-to-Net-Framework-35.aspx[^]

Posted 4-Dec-12 8:09am

Surendra0x2

Solution 2

for converting

you have to set
<targetframeworkversion>v3.5

on web.config

and try following also

XML

<configSections>
        <sectionGroup name="system.web.extensions" type="System.Web.Configuration.SystemWebExtensionsSectionGroup, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35">
            <sectionGroup name="scripting" type="System.Web.Configuration.ScriptingSectionGroup, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35">
                <section name="scriptResourceHandler" type="System.Web.Configuration.ScriptingScriptResourceHandlerSection, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" allowDefinition="MachineToApplication"/>
                <sectionGroup name="webServices" type="System.Web.Configuration.ScriptingWebServicesSectionGroup, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35">
                    <section name="jsonSerialization" type="System.Web.Configuration.ScriptingJsonSerializationSection, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" allowDefinition="Everywhere"/>
                    <section name="profileService" type="System.Web.Configuration.ScriptingProfileServiceSection, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" allowDefinition="MachineToApplication"/>
                    <section name="authenticationService" type="System.Web.Configuration.ScriptingAuthenticationServiceSection, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" allowDefinition="MachineToApplication"/>
                    <section name="roleService" type="System.Web.Configuration.ScriptingRoleServiceSection, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" allowDefinition="MachineToApplication"/>
                </sectionGroup>
            </sectionGroup>
        </sectionGroup>
    </configSections>

Posted 4-Dec-12 6:51am

avjabalpur

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Surendra0x2 4-Dec-12 14:08pm

Instead of this Do this-
http://alanfeekery.com/2011/03/28/changing-the-asp-net-target-framework-in-visual-web/

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lewax00 · Accepted Answer · 2012-12-04T06:29:00

Solution 1

Go into your project properties (right click your project, and click "Properties"), under the "Application" section, and change "Target framework" to ".NET Framework 3.5" or ".NET Framework 3.5 Client Profile", then fix any errors that appear (if any).

Posted 4-Dec-12 6:29am

lewax00

Comments

Thomas Daniels 4-Dec-12 12:40pm

Good answer, +5!