Solution for Error : "webforms unobtrusivevalidationmode requires a scriptresourcemapping for 'jquery'"

In 2012 Error Message shown like this,
"webforms unobtrusivevalidationmode requires a scriptresourcemapping for 'jquery'"

add the following line in web.config under configuration tag,
<configuration>
<appSettings>
    <add key="ValidationSettings:UnobtrusiveValidationMode" value="None" />
</appSettings>
.
.
.
</configuration>