Unable to connect Oracle 10g Express from Visual Studio Server Explorer

Hello,
Please help me out here. I am connecting from Visual Studio 2008 to Oracle 10g Express Edition and the I have installed the ODAC 11 and the ODP.NET as well for Visual Studio(Both include Oracle Developer tools). But whenever I tried to connect from my Visual Studio 2008 server explorer so that I can have the database and its object there, I do get this error : "ORA-12560 : TNS: protocol adapter error."
The following is what I specified in my connection box:
DataSource Name: (Local Database)
Username : HR
Password: the password for it.
My OS is : Windows Vista Ultimate.
Please anyone who has solved such error should just help out here.
Thanks all

Thank you for your reply. I will like to know if you can use Visual Studio. In visual studio there is what we called Server Explorer and from there you can create connection and access all the database server from there. I am able to connect to the Oracle XE through the browser and I was able to crete table and other stuffs like that but when I tried to connect from Visual Studio 2008, I get the 12560 Error. I checked my TNSNAMES and found this:
XE =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = OLAMMIE)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = XE)
EXTPROC_CONNECTION_DATA =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC_FOR_XE))
(CONNECT_DATA =
(SID = PLSExtProc)
(PRESENTATION = RO)
ORACLR_CONNECTION_DATA =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC_FOR_XE))
(CONNECT_DATA =
(SID = CLRExtProc)
(PRESENTATION = RO)
Look at what I have in my Sqlnet.Ora file,
# This file is actually generated by netca. But if customers choose to
# install "Software Only", this file wont exist and without the native
# authentication, they will not be able to connect to the database on NT.
SQLNET.AUTHENTICATION_SERVICES = (NTS)
Please kindly help me out of this as it is very urgent. I can connect from browser using http://127.0.0.1:8080/apex but cannot connect from my C# code and Server Explorer. What is likely to cause this error.
Thank you for helping me in advance.

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2.
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3.
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4.
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5.
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7.
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8.
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10.
Go to HKEY_LOCAL_MACHINE\SOFTWARE\ODBC\ODBCINST.INI.
11.
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12.
Go to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services.
13.
Delete the following keys:
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OracleXEClrAgent
OracleXETNSListener
14.
Go to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Eventlog\Application.
15.
Delete the Oracle.xe key.
16.
Exit the Registry Editor.
17.
Restart your computer.
Thanks,
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Edited by: user10888288 on May 3, 2010 5:58 AM

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{noformat}
Good day,
I'm slightly unaccustomed to using forums, so bear with me.
My initial connection to the Oracle database takes approximately 30 seconds. It seems to be waiting for a connection before timing out and trying another connection which works, as all subsequent connections work immediately. I'm unsure how other people's responses in forums can help me due to the plethora of configurations, so here's mine. My comprehension of the oracle world is still growing, you'll have to explain the terms you're using for me, Hoping you can help.
I'm using Visual Studio 2008, set to use 32 bit debug mode, on a Windows 7 Pro platform. Also using Oracle 10g Xe, and have installed the 32 bit version of ODAC 11.2 (11.2.0.1) to aid making a connection from Visual Studio to Oracle.
I have a database set up and a user with system admin rights. This is all local for a programming project and will never see the light of day outside of my personal machine.
I am using code to connect, not the GUI. I wish to code this project completely without the aid of the GUI. so my connection string within Visual Studio C# is (pw/id hidden)...
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My c:\devsuitehome\network\admin\sqlnet.ora file is this:
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# Generated by Oracle configuration tools.
SQLNET.AUTHENTICATION_SERVICES= (NTS)
NAMES.DIRECTORY_PATH= (LDAP, TNSNAMES, EZCONNECT, ONAMES, HOSTNAME)
And my c:\devsuitehome\network\admin\TNSNames.ora file is this:
tnsnames.ora Network Configuration File: C:\DevSuiteHome\network\admin\tnsnames.ora
Generated by Oracle configuration tools.
XE =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 127.0.0.1)(PORT = 1521))
(CONNECT_DATA =
(SERVICE_NAME = xe)
EXTPROC_CONNECTION_DATA =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = <machine name)(PORT = 1521))
(CONNECT_DATA =
(SERVICE_NAME = PLSExtProc)
Just for good measure, my tnsping xe shows:
"Used paramter files:<br/>
c:\devsuitehome\network\admin\sqlnet.ora<br/><br/>
Used TNSNAMES adapter to resolve the alias<br/>
Attempting to contact (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)(HOST = 127.0.0.1)(PORT = 1521)))(CONNECT_DATA = (SERVICE_NAME = xe)))
OK (0 msec)"
So, how can I make that initial connection faster so I don't spend 15 years testing my application due to slow start-ups? :)
Thank you.
Kevin.
{noformat}
Edited by: 832285 on Jan 29, 2011 10:08 AM
Edited by: 832285 on Jan 29, 2011 10:10 AM

I have formatted my hard drive since my first post. I was running window 64 bit with a higher version of the ODAC and that proved to crash my machine with faulty error messages about memory. I have reverted to a previous version of the ODAC tools and everything works very smooth now. Still the connection time is consistently 20 seconds or longer on the first attempt.
Just a little more information.. I am currently taking a college course with 15 other students, as you can tell by the impersonal machine name, where programming using visual studio 2008, and Oracle 10g xe is expected. All of us are using a 64 bit environment and we all have difficulties cutting down the load time of making the first connection to Oracle. Some people are longer making the connection, but none are shorter.
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Here is the information you requested
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Imports Oracle.DataAccess.Client
Also included project reference: oracle.dataaccess / version 2.111.6.20
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Copyright (c) 1997, 2005, Oracle. All rights reserved.
Used parameter files:
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I am running this laptop with 4 gigs of ram. This is a typical environment I would be running my application in.
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total 4090
cached 1753
available 2345
free 656
system
handles 27141
threads 911
processes 70
commit megs 2860/8179
kernel memory megs
paged 201
nonpaged 52
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