SELECT permission denied on object 'User_Details', database 'LOCAL_CCOS_Prod', owner 'dbo'.

Dear Experts?
                      I have already sql server 2000 , I installed sql server 2005 trial version few days back.
 ccose is the username I used to login in sql server 2000. When I run my .net application I am getting this error.
SELECT permission denied on object 'User_Details', database 'LOCAL_CCOS_Prod', owner 'dbo'.
SELECT permission denied on object 'User_Details', database 'LOCAL_CCOS_Prod', owner 'dbo'.

When I run the below mentioned query, it solves the above mentioned error.

grant select on user_details to ccose

once again When I run my .net application I am getting insert,update permission denial problem.
In sql server 2000, When I create a new table I don't give any permission because ccose is dbo owner
same thing is applicable for sql server 2005 then why I am  facing problems?

What is the exact way to migrate from sql server 2000 to sql server 2005? (whether to keep sql server 2000 and install sql server 2005 or uninstall sql server 2000 and install sql server 2005)

Please advice me.

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The logic is pretty much the same, but you probably have orphaned users. Have a look over here to see how to migrate logins between SQL 2000 and SQL 2005:

I would recommend running SQL 2K and SQL 2005 side-by-side until you have migrated and tested all your databases, and then turning off SQL 2K. Having the other instance running gives you a fall-back position in the case of problems.

Also, look here for the Upgrade Advisor:

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