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

            SecUtility.CheckParameter( ref username, true, true, true, 256, "username" );

            string encodedPasswordAnswer = GetEncodedPasswordAnswer(username, passwordAnswer);
            SecUtility.CheckParameter(ref encodedPasswordAnswer, RequiresQuestionAndAnswer, RequiresQuestionAndAnswer, false, 128, "passwordAnswer");

            string errText;
            int passwordFormat = 0;
            int status = 0;

            string pass = GetPasswordFromDB(username, encodedPasswordAnswer, RequiresQuestionAndAnswer, out passwordFormat, out status);

            if ( pass == null )
            {
                errText = GetExceptionText( status );
                if ( IsStatusDueToBadPassword( status ) )
                {
                    throw new MembershipPasswordException( errText );
                }
                else
                {
                    throw new ProviderException( errText );
                }
            }

            return UnEncodePassword( pass, passwordFormat );
        }

        //////////////////////////////////////////////////////////////////////
        //////////////////////////////////////////////////////////////////////
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