自定义asp.net2.0权限提供程序SqlMembershipProvider

            if( PasswordStrengthRegularExpression.Length > 0 )
            {
                if( !Regex.IsMatch( password, PasswordStrengthRegularExpression ) )
                {
                    status = MembershipCreateStatus.InvalidPassword;
                    return null;
                }
            }

            ValidatePasswordEventArgs e = new ValidatePasswordEventArgs( username, password, true );
            OnValidatingPassword( e );

            if( e.Cancel )
            {
                status = MembershipCreateStatus.InvalidPassword;
                return null;
            }

            try
            {
                SqlConnectionHolder holder = null;
                try {
                    holder = SqlConnectionHelper.GetConnection( _sqlConnectionString, true );
                    CheckSchemaVersion( holder.Connection );

                    DateTime    dt  = RoundToSeconds(DateTime.UtcNow);
                    SqlCommand  cmd = new SqlCommand("aspnet_Membership_CreateUser", holder.Connection);

                    cmd.CommandTimeout = CommandTimeout;