Member Avatar for cocoll

hello.
i have oracle 11g installed on 64 bits laptop running with windows 7.
and i manage the ODBC driver fro oracle from the administrative tools ,and i tested the connection from there and everything is okay.
but then i tried to connect to oracle 11g DB using visual studio 2010,so i have this error:
"ERROR [IM002] [Microsoft][ODBC Driver Manager] Data source name not found and no default driver specified"
so the problem that i have an 64 bits driver and visual studio 2010 is a 32 bits, so that is the problem.
so anyone had an idea to solve this problem?
thank you in advance.

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Dani AI

Generated

Short diagnosis and concrete fixes (three quick options).

The IM014 text means the ODBC Driver Manager cannot load a driver whose “bitness” differs from the calling process — a 32-bit process can only load 32-bit ODBC drivers and a 64-bit process can only load 64-bit drivers. ()

Practical options (pick one that fits your workflow):

  • Install the 32‑bit Oracle client/ODBC and create a 32‑bit DSN with the 32‑bit ODBC Administrator (%windir%\SysWOW64\odbcad32.exe). That makes the DSN visible to 32‑bit processes. Follow the Instant Client / ODBC install steps for the matching (32‑bit) package. (learn.microsoft.com)

  • Drop ODBC entirely and use Oracle’s fully managed ODP.NET provider (Oracle.ManagedDataAccess). It’s a managed AnyCPU assembly (no separate Oracle client/ODBC required), so you avoid the driver/app architecture mismatch. Add the NuGet package and use OracleConnection instead of OdbcConnection; for example:

using Oracle.ManagedDataAccess.Client;

using(var conn = new OracleConnection("User Id=system;Password=yourpwd;Data Source=localhost:1521/orcl;"))
{
    conn.Open();
    // use commands...
}

See Oracle’s ODP.NET Managed Driver docs for installation and examples. (docs.oracle.com)

  • If you prefer to keep the 64‑bit Oracle client/ODBC, run the site under a 64‑bit host (a 64‑bit IIS app pool) so the 64‑bit driver can be loaded. (Visual Studio’s older IDE/dev servers run as 32‑bit; Visual Studio itself only became a 64‑bit process starting with VS 2022.) (devblogs.microsoft.com)

Troubleshooting notes: when you install both bitness versions, control PATH order and test with SQL*Plus or the correct odbcad32.exe; name DSNs distinctly (e.g., orcl_32 / orcl_64) to avoid confusion. If you try the managed ODP.NET route, update code/connection string and remove dependency on the ODBC DSN. (oracle.com)

Context: ’s IM014 diagnosis is consistent with this root cause; ’s suggestion to recheck connection strings/listener is still useful once the bitness/driver choice is resolved.

Member Avatar for naveedqadri

Did you check your webconfig file for data source like orcl etc , and also listener , some thng you missing or not configured properly.
1st check listeners and ping at that maching
2nd check web.config
3rd connection string in your application.

Best of Luck

Member Avatar for cocoll

thank you for your reply,but i am so sorry,the error is:

ERROR [IM014] [Microsoft][ODBC Driver Manager] The specified DSN contains an architecture mismatch between the Driver and Application

so if i can use another method for connection or another driver,so i really appreciate the help.
thank you.

Member Avatar for naveedqadri

can you put your whole web.config whole code to review and help you.

Member Avatar for cocoll

why i need web.comfig,i don;t use it,i know that i can put the connection string in it and others but i don't use it at this stage,i tried to connect to oracle 11g with windows application with no succeed,however i will put the code and the web.config.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data.Odbc;
public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        String con = "DSN=orcl;Driver={Microsoft ODBC for Oracle};UID=system;PWD=password;SERVER=localhost;";
        OdbcConnection conx = new OdbcConnection(con);
        conx.Open();
        conx.Close();
       
    }
}

the web.config that i don't use:

<?xml version="1.0"?>
<!--
  For more information on how to configure your ASP.NET application, please visit
  http://go.microsoft.com/fwlink/?LinkId=169433
  -->
<configuration>
	<system.web>
		<compilation debug="true" targetFramework="4.0"/>
	</system.web>
</configuration>

i searched in the internet and the problem that oracle 11g driver is 64 bits and VS 2010 is 32bits.
thank you

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