Cannot implicitly convert type 'System.Web.Security.MembershipProvider' to Telerik.Sitefinity.Security.Data.MembershipDataProvider

Question

I am new to sitefinity and MVC, I have the following code:-

MembershipDataProvider membership;

if (HttpContext.Request != null && HttpContext.Request.UrlReferrer != null &&
    HttpContext.Request.UrlReferrer.Authority != null &&
    HttpContext.Request.UrlReferrer.Authority.Equals(businessprovider.GetValueByKey(SitefinityURI)))
{
  **membership = Membership.Providers[Constants.CredentialServiceMembershipProvider];**

}

I am using Sitefinity membership Provider and trying to get a collection of membership provider for sitefinity but I am getting the following error

Cannot implicitly convert type 'System.Web.Security.MembershipProvider' to Telerik.Sitefinity.Security.Data.MembershipDataProvider.