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

p;     if( objValue == null )
            {
                param.IsNullable = true;
                param.Value = DBNull.Value;
            }
            else
            {
                param.Value = objValue;
            }

            return param;
        }

        /////////////////////////////////////////////////////////////////////////////
        /////////////////////////////////////////////////////////////////////////////
        private string GetNullableString(SqlDataReader reader, int col)
        {
            if( reader.IsDBNull( col ) == false )
            {
                return reader.GetString( col );
            }

            return null;
        }
        /////////////////////////////////////////////////////////////////////////////
        /////////////////////////////////////////////////////////////////////////////
        private string GetExceptionText(int status) {
            string key;
            switch (status)
            {
            case 0:
                return String.Empty;
            case 1:
                key = SR.Membership_UserNotFound;
                break;
            case 2:
                key = SR.Membership_WrongPassword;
    &nb