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The MembershipUser.ProviderUserKey property exposes the identifier from the membership data source typed as object. The type of the identifier depends on the System.Web.Security.MembershipProvider or the System.Web.Security.MembershipUser. In the case of the System.Web.Security.SqlMembershipProvider, the MembershipUser.ProviderUserKey can be cast as a Guid, since the System.Web.Security.SqlMembershipProvider stores the user identifier as a System.Data.SqlDbType.UniqueIdentifier.