Step by Step configure your sharepoint running with .NET Framework 3.5

Step by Step configure your sharepoint running with .NET Framework 3.5

(Do not forget to backup your web.config file)

1) First setup Framework 3.5 to your server.And you already have got a Web Application on which you want to do these changes.

2)Add fallowings to Web.Congif in configuration -> 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>

3-) Add fallowings to web.config sharepoint->SafeControls

      <SafeControl Assembly="System.Web.Silverlight,Version=2.0.5.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" Namespace="System.Web.UI.SilverlightControls" TypeName="*" Safe="True" />

      <SafeControl Assembly="System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" Namespace="System.Web.UI" TypeName="*" Safe="True" />

4-) Add fallowings to web.config System.Web->httphandlers

      <add verb="*" path="*.asmx" validate="false" type="System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>

      <add verb="*" path="*_AppService.axd" validate="false" type="System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>

      <add verb="GET,HEAD" path="ScriptResource.axd" type="System.Web.Handlers.ScriptResourceHandler, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" validate="false"/>

5-) Add fallowings to web.config System.Web->httpmodules

      <add name="ScriptModule" type="System.Web.Handlers.ScriptModule, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>

6-) Add fallowings to web.config System.Web->compilation->assemblies

        <add assembly="System.Core,Version=3.5.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>

        <add assembly="System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>

        <add assembly="System.Data.DataSetExtensions,  Version=3.5.0.0, Culture=neutral,   PublicKeyToken=B77A5C561934E089"/>

        <add assembly="System.Xml.Linq, Version=3.5.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>

7-)Add fallowings to web.config System.Web->Pages

      <controls>

        <add tagPrefix="asp" namespace="System.Web.UI"

              assembly="System.Web.Extensions, Version=3.5.0.0, Culture=neutral,

        PublicKeyToken=31BF3856AD364E35"/>

        <add tagPrefix="asp" namespace="System.Web.UI.WebControls"

              assembly="System.Web.Extensions, Version=3.5.0.0, Culture=neutral,

        PublicKeyToken=31BF3856AD364E35"/>

        <add tagPrefix="cc1" namespace="AjaxControlToolkit" assembly="AjaxControlToolkit"/>

        <add namespace="ProfileDAL" assembly="ProfileDAL ,Version=0.0.0.0,Culture=neutral, PublicKeyToken=aa99289942830a2b" tagPrefix="cc1" />

      </controls>

8-)Add fallowings to web.config

  <system.web.extensions>

    <scripting>

      <webServices>

      </webServices>

    </scripting>

  </system.web.extensions>

  <system.webServer>

    <validation validateIntegratedModeConfiguration="false"/>

    <modules>

      <add name="ScriptModule" preCondition="integratedMode"

          type="System.Web.Handlers.ScriptModule,

            System.Web.Extensions, Version=1.0.61025.0, Culture=neutral,

            PublicKeyToken=31bf3856ad364e35"/>

    </modules>

    <handlers>

      <remove name="WebServiceHandlerFactory-Integrated" />

      <add name="ScriptHandlerFactory" verb="*"

          path="*.asmx" preCondition="integratedMode"

          type="System.Web.Script.Services.ScriptHandlerFactory,

            System.Web.Extensions, Version=1.0.61025.0, Culture=neutral,

            PublicKeyToken=31bf3856ad364e35"/>

      <add name="ScriptHandlerFactoryAppServices" verb="*"

          path="*_AppService.axd" preCondition="integratedMode"

          type="System.Web.Script.Services.ScriptHandlerFactory,

            System.Web.Extensions, Version=1.0.61025.0, Culture=neutral,

            PublicKeyToken=31bf3856ad364e35"/>

      <add name="ScriptResource" preCondition="integratedMode"

          verb="GET,HEAD" path="ScriptResource.axd"

          type="System.Web.Handlers.ScriptResourceHandler,

            System.Web.Extensions, Version=1.0.61025.0, Culture=neutral,

            PublicKeyToken=31bf3856ad364e35" />

    </handlers>

  </system.webServer>

  <system.codedom>

    <compilers>

      <compiler language="c#;cs;csharp" extension=".cs"

compilerOptions="/warnaserror-" warningLevel="4"

type="Microsoft.CSharp.CSharpCodeProvider, System, Version=2.0.0.0,

Culture=neutral, PublicKeyToken=b77a5c561934e089">

        <providerOption name="CompilerVersion" value="v3.5"/>

      </compiler>

      <compiler language="vb;vbs;visualbasic;vbscript"

extension=".vb" compilerOptions="/optioninfer+"

type="Microsoft.VisualBasic.VBCodeProvider, System, Version=2.0.0.0,

Culture=neutral, PublicKeyToken=b77a5c561934e089">

        <providerOption name="CompilerVersion" value="v3.5"/>

      </compiler>

    </compilers>

  </system.codedom>

9-) Reset iis