HELP ....difficulty In Insert Of 2 Tables Data With Id

 Hello frdz,
             I have two tables in sqlserver 2005.
             I have created the stored procedure for insert,update data.I m creating my application in asp.net with C#
 
 Table-1 CUSTOMER

Fields:

customerid int identity,
cardid int,
customername varchar(20) not null,
address varchar(20) not null,
city varchar(20) not null,
emailid varchar(20)



Table-2 CARD

Fields:

cardid int identity,
cardtype varchar(20) not null,
carddetails varchar(20) not null



INSERT INTO CUSTOMER (customername ,address,city,emailid)
VALUES (@customername,@address,@city,@emailid)
SELECT @customerid = SCOPE_IDENTITY()

/* HELP HERE NOT ABLE TO GET DATA OF CARD */
SELECT @cardid = cardid from CARD where customerid =@cardid  Pls tell me how to insert the data ...There is only one cardid for only one customerid both should be unique no duplication....One customer can have only one and one card...