Oracle Membership not working in WCF

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WCFServices

Hi All
I am facing issue to implement Oracle membership provider in WCF Service.
I have created mvc 4 application and used Oracle Managed driver
I have written code below
MembershipUser user1 = Membership.GetUser(_userAuthentication.UserName);
if(user1==null)//sample code
{
MembershipCreateStatus createStatus;
Membership.CreateUser(_userAuthentication.UserName, _userAuthentication.PassWord, "xyz@xyz.com", "song", "mysong", false, null, out createStatus);
}
Above code is working fine in mvc application
but not working in wcf service. Its giving exception like
"The provider is not compatible with the version of Oracle client"
But I used same provided in WCF service (App.config) which i used in mvc application.
Please Help me...