Cannot connect Oracle Form to my Oracle 10g Database

Hi Guru,
Could you guys help me out on below? I have been running Oracle 10g personal XE edition and Sql Developer on Windows XP. I am able to connect using TNS as connect type when I am connecting from my SQL Developer to my database.
Today, I installed Oracle Forms, Form builders. I choose connect and provide these info
username: my username
password: my password
Database: XE
I received ORA- 12154 TNS: could not resolve the connect identifier specified.
Anyone I doing something wrong?

Hi,
What is your forms version (The location of tnsnames.ora is different for 11g).?
As Baig mentioned, you first need to create an alias in the tnsnames.ora file, like
mydb =
(DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP) (HOST = <your_host_name_where_db_is_installed>)(PORT = <port_default_is_1521>))
    (CONNECT_DATA = (SID = <SID_In_your_case_i_suppose_it_is_XE>))
)Then, from forms you connect like
username: my username
password: my password
Database: mydb <== This is the alias you've created in your tnsnames.ora as above
HTH
-Arun

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