encryption with certificate

I am trying to create a encrypted row in my database
Everything here worked except that when i run the final query to decrypt the data
It just comes up with null for each row. Even if i do a query to show me the rows that are not null
It's like it is saying yeah there is data here but I am only going to show you null instead of what I am supposed to decrypt.
Here is what I tried from start to finish

Create Certificate TestCertEncryptionBy Password ='Password'With Subject ='SQLCert',Expiry_Date ='12/01/2050';declare @.Testnvarchar(50)set @.Test='123456789'insert into testenc (testencry)Values (encryptbyCert(Cert_ID('TestCert'),@.Test ))selectconvert (Nvarchar(50),DecryptByCert(Cert_ID('TestCert'),testencry,N'Password'))As Testfrom testenc

I am using sql 2005 by the way|||Nevermind Just realized I need to use VarBinary instead of NvarChar to store the data!