How To Add New Values Into A Aspnet_membership?

First of all, I used createnewuserwizd in vwd05 and customize more inputbox than the default, like firstname, and lastname, now I would like to add those new values into a aspnet_membership table, I try to modified the aspnet_membership_createUser store procedure, but  it doesn't work .......  Here is my aspnet_membership_createUser code:

------------------->  Code Begin  <---------------------------------------

ALTER PROCEDURE dbo.aspnet_Membership_CreateUser

@ApplicationName nvarchar(256),

@UserName nvarchar(256),

@Password nvarchar(128),

@FirstName nvarchar(128),

@PasswordSalt nvarchar(128),

@Email nvarchar(256),

@PasswordQuestion nvarchar(256),

@PasswordAnswer nvarchar(128),

@IsApproved bit,

@CurrentTimeUtc datetime,

@CreateDate datetime = NULL,

@UniqueEmail int = 0,

@PasswordFormat int = 0,

@UserId uniqueidentifier OUTPUT

AS

BEGIN

DECLARE @ApplicationId uniqueidentifier

SELECT @ApplicationId = NULL

DECLARE @NewUserId uniqueidentifier

SELECT @NewUserId = NULL



DECLARE @IsLockedOut bit

SET @IsLockedOut = 0

DECLARE @LastLockoutDate datetime

SET @LastLockoutDate = CONVERT( datetime, '17540101', 112 )

DECLARE @FailedPasswordAttemptCount int

SET @FailedPasswordAttemptCount = 0

DECLARE @FailedPasswordAttemptWindowStart datetime

SET @FailedPasswordAttemptWindowStart = CONVERT( datetime, '17540101', 112 )

DECLARE @FailedPasswordAnswerAttemptCount int

SET @FailedPasswordAnswerAttemptCount = 0

DECLARE @FailedPasswordAnswerAttemptWindowStart datetime

SET @FailedPasswordAnswerAttemptWindowStart = CONVERT( datetime, '17540101', 112 )

DECLARE @NewUserCreated bit

DECLARE @ReturnValue int

SET @ReturnValue = 0

DECLARE @ErrorCode int

SET @ErrorCode = 0

DECLARE @TranStarted bit

SET @TranStarted = 0

IF( @@TRANCOUNT = 0 )

BEGIN

BEGIN TRANSACTION

SET @TranStarted = 1

END

ELSE

SET @TranStarted = 0

EXEC dbo.aspnet_Applications_CreateApplication @ApplicationName, @ApplicationId OUTPUT

IF( @@ERROR <> 0 )

BEGIN

SET @ErrorCode = -1

GOTO Cleanup

END

SET @CreateDate = @CurrentTimeUtc

SELECT @NewUserId = UserId FROM dbo.aspnet_Users WHERE LOWER(@UserName) = LoweredUserName AND @ApplicationId = ApplicationId

IF ( @NewUserId IS NULL )

BEGIN

SET @NewUserId = @UserId

EXEC @ReturnValue = dbo.aspnet_Users_CreateUser @ApplicationId, @UserName, 0, @CreateDate, @NewUserId OUTPUT

SET @NewUserCreated = 1

END

ELSE

BEGIN

SET @NewUserCreated = 0

IF( @NewUserId <> @UserId AND @UserId IS NOT NULL )

BEGIN

SET @ErrorCode = 6

GOTO Cleanup

END

END

IF( @@ERROR <> 0 )

BEGIN

SET @ErrorCode = -1

GOTO Cleanup

END

IF( @ReturnValue = -1 )

BEGIN

SET @ErrorCode = 10

GOTO Cleanup

END

IF ( EXISTS ( SELECT UserId

FROM dbo.aspnet_Membership

WHERE @NewUserId = UserId ) )

BEGIN

SET @ErrorCode = 6

GOTO Cleanup

END

SET @UserId = @NewUserId

IF (@UniqueEmail = 1)

BEGIN

IF (EXISTS (SELECT *

FROM dbo.aspnet_Membership m WITH ( UPDLOCK, HOLDLOCK )

WHERE ApplicationId = @ApplicationId AND LoweredEmail = LOWER(@Email)))

BEGIN

SET @ErrorCode = 7

GOTO Cleanup

END

END

IF (@NewUserCreated = 0)

BEGIN

UPDATE dbo.aspnet_Users

SET LastActivityDate = @CreateDate

WHERE @UserId = UserId

IF( @@ERROR <> 0 )

BEGIN

SET @ErrorCode = -1

GOTO Cleanup

END

END

INSERT INTO dbo.aspnet_Membership

( ApplicationId,

UserId,

Password,

FirstName,

PasswordSalt,

Email,

LoweredEmail,

PasswordQuestion,

PasswordAnswer,

PasswordFormat,

IsApproved,

IsLockedOut,

CreateDate,

LastLoginDate,

LastPasswordChangedDate,

LastLockoutDate,

FailedPasswordAttemptCount,

FailedPasswordAttemptWindowStart,

FailedPasswordAnswerAttemptCount,

FailedPasswordAnswerAttemptWindowStart )

VALUES ( @ApplicationId,

@UserId,

@Password,

@FirstName,

@PasswordSalt,

@Email,

LOWER(@Email),

@PasswordQuestion,

@PasswordAnswer,

@PasswordFormat,

@IsApproved,

@IsLockedOut,

@CreateDate,

@CreateDate,

@CreateDate,

@LastLockoutDate,

@FailedPasswordAttemptCount,

@FailedPasswordAttemptWindowStart,

@FailedPasswordAnswerAttemptCount,

@FailedPasswordAnswerAttemptWindowStart )

IF( @@ERROR <> 0 )

BEGIN

SET @ErrorCode = -1

GOTO Cleanup

END

IF( @TranStarted = 1 )

BEGIN

SET @TranStarted = 0

COMMIT TRANSACTION

END

RETURN 0

Cleanup:

IF( @TranStarted = 1 )

BEGIN

SET @TranStarted = 0

ROLLBACK TRANSACTION

END

RETURN @ErrorCode

END

---------------------------------------->  Code End <-----------------------------------------------------

Please Help me out I try everything and everything, but the right thing please help me out, I really appreciated .......