Connection Problem When Using Oracle Developer Tools for Visual Studio

Question

I tried to create an Oracle Connection in my Visual Studio 2008 after installing Oracle 11g, Oracle Data Access Components (ODAC) with Oracle Devleoper Tools for Vissual Studio version 11.1.0.6.20.
I followed the directions according to "Building .NET Applications Using Oracle Developer Tools for Visual Studio, when I click Test Connection, I keep getting the error message below.
Microsoft Visual Studio
ORA-12170: TNS:Connect timeout occurred
OK
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Answer 1

I solved the problem.
This is what I did for the benefit of the embryonic newbe like me.
On the Add Connection Dialog
1.     For Data source name I selected Local Database
2.     I clicked on the specific User Name and I typed SYSTEM
3.     For Password, I typed orcl (the password I setup during the installation) (HR did not work for me for User name and Password according to the tutorial instructions)
4.     For Role, I selected Default
5.     Connection Name, I selected Local Database
6.     Before proceeding any further went to Windows XP SP3 where I was operating from, under Start Menu, I selected Administrative Tools then Services
a.     On the Windows Services (Local) Dialog, under name, I selected OracleServiceORCL and OracleOraDb11g_home1TNSListener. I clicked on them one at a time
b.     On the presented Dialog, under Service Status, I Clicked on the Start Button to start the Services
c.     Then I went back to the Add Connection Dialog. I clicked on Test Connection, it connected okay. I finally clicked on Okay to connect.