VS 2008 -- ORACLE -- TNSNAMES Connection

I created the below VS 2008 .net 3.5 Windows (non-web) Oracle APP, installed the .EXE on my machine accessing the remote DB and it worked.  I then upgraded my coworker's machine to .net 3.5, rebooted, installed the OracleClient, configured the TNSNAMES file to be the same as my file, installed the APP, and get the following error when running the app:

ORA-12514: TNS:listener could not resolve SERVICE_NAME given in connect descriptor

What else do I need to install or fix ?
---------------------------------------------------
Setup
 1. drop FMFORMULA gridView onto form
 2. drag FMENTITY gridView next to FMFORMULA
    gridView & delete FMENTITY gridView
     ** gets FMENTITY BindingSource
        and TableAdapter onto page
 3. edit FMFORMULA gridView COLUMNS
     ** FMENTITYID column
          a. READONLY = True
          b. ColumnType = ComboBox
          c. DataSource = fMENTITYBindingSource
          d. DisplayMember = FMENTITYNAME
          e. ValueMember = FMENTITYOBJECTID
          f. HeaderText = ENTITY
          g. DisplayStyle = Nothing
     ** FMCODE column
          a. READONLY = True
     ** FMVERSION column
          a. READONLY = keep "False"
     ** other columns
          a. Delete
 4. create gridView "DataError" EVENT
    messagebox ("Please enter numbers")
 5. add "order by FMCODE, FMENTITYID, FMVERSION"
    to DataSet1.xsd FMFORMULATableAdapter "FILL"
Adding Search
 6. rightClick DataSet1.xsd FMFORMULATableAdapter
      ** Add, Query, Select
      ** WHERE FMCODE = :FMCODE
           ** don't use "WHERE FMCODE = @FMCODE" like MSSQL uses
      ** add "order by FMCODE, FMENTITYID, FMVERSION"
         to DataSet1.xsd FMFORMULATableAdapter if needed
      ** Fill METHOD NAME = FillBy
      ** Return METHOD NAME = GetDataBy
 7. add below CONTROLS to existing Form1.cs "ToolStrip"
     ** Sepeartor
     ** Label
          a. TEXT = Search By Formula
     ** Textbox
          a. NAME = txt_FormulaCode
     ** Button
          a. DisplayStyle = Text
          b. Text = SUBMIT
          c. Click EVENT = toolStripButton1_Click
               ** this.fMFORMULATableAdapter.FillBy(this.dataSet1.FMFORMULA,this.txt_FormulaCode.Text);
     ** Button
          a. DisplayStyle = Text
          b. Text = CLEAR
          c. Click EVENT = toolStripButton2_Click
               ** this.fMFORMULATableAdapter.Fill(this.dataSet1.FMFORMULA);
 8. test by doing above "Summary" section, WORKS
finance_teacherAsked:
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mrjoltcolaCommented:
From his machine, try tnsping <SERVICE NAME>

Your listener must be reachable from his PC.

Is there a firewall?
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finance_teacherAuthor Commented:
Steps I did
 1. made sure .net 3.5 was working
 2. made sure "tnsping DB..." worked

What other things should I check ?
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it-rexCommented:
we have hit this before looks like your VS config file is using a differnt service name than the one your are using ;
with tnsping you can use a ny valid service name you have chosen but with MS apps you need to make sure it is the smae like your config file.


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