Configuration setting for using different version of an assembly

<configurations>
<runtime>
        <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
            <dependentAssembly>
                <assemblyIdentity name="System.Web.Extensions" publicKeyToken="31BF3856AD364E35"/>
                <bindingRedirect oldVersion="3.5.0.0" newVersion="1.0.61025.0"/>
            </dependentAssembly>
            <dependentAssembly>
                <assemblyIdentity name="System.Web.Extensions.Design" publicKeyToken="31BF3856AD364E35"/>
                <bindingRedirect oldVersion="3.5.0.0" newVersion="1.0.61025.0"/>
            </dependentAssembly>
        </assemblyBinding>
    </runtime>
</configurations>