Error when debug c# code in 64 bit environment

Question

It seems the default running environment of Visual Studio is 32 bit. And I need to run one of my application in 64 bit mode. I did the change in project property like 'Platform Target' to 64 bit. But now am not able to run my application. I got an error like "Could not load file or assembly 'MyProject' or one of its dependencies. An attempt was made to load a program with an incorrect format."

Then I tried with a new blank WebApplication. Still in there also showing the same error. I remove all the reference dll files and added the dependencies from this path "C:\Windows\Microsoft.NET\Framework64". But unfortunately Still am getting same error.

I changed the Application Pool property of my IIS (Enable 32-Bit Application = True). Then tried to run in Local IIS Web Server but that too didn't worked.

Am using Windows 7, 64 bit OS and Visual Studio 2010. And when using the following c# code to find the running environment

using (RegistryKey registryKey = 
    Registry.LocalMachine.OpenSubKey(@"SOFTWARE\R-core\R"))
{
    var envPath = Environment.GetEnvironmentVariable("PATH");
string rBinPath = (string)registryKey.GetValue("InstallPath");
string rVersion = (string)registryKey.GetValue("Current Version");
rBinPath = System.Environment.Is64BitProcess 
        ? rBinPath + "\\bin\\x64" :rBinPath + "\\bin\\i386";
    Environment.SetEnvironmentVariable(
        "PATH",
    envPath + Path.PathSeparator + rBinPath);
}

The value of System.Environment.Is64BitProcess is always false I didn't want to follow the 64 bit path, if the running environment is 32 bit. So how to force VS to run in 64 bit mode?

Here I shared the error response page I got. Please help me to solve this issue Thank you.

Error Response Page

The Enable 32-Bit Application must be set to false if you targeted 64 bits during build ? — NicoD
– NicoD, Commented Jun 24, 2014 at 11:57
I tried by setting the Enable 32-Bit Application = False first, but i didn't get the expected outcome. Then i tried by changing that value to True also. — Rameez
– Rameez, Commented Jun 24, 2014 at 12:01
Try with a fresh empty web app. Target x64bits. Set Enable 32-Bit Application = False. Check it's the right pool for your app. It's should be ok. — NicoD
– NicoD, Commented Jun 24, 2014 at 12:07
Oh Sorry NicoD, That I already tried... As i mentioned in my question, I created a new Empty Web App, then Change the Platform Target to x64 without changing any other settings and tried to run, but failed. Then i changed the dependencies and tried still not get the expected outcome. Then i changed the Enable 32-Bit Application, likewise one by one i tried by changing all the settings.. But didn't succeeded — Rameez
– Rameez, Commented Jun 24, 2014 at 12:17
But you publish the app or modified the properties in visual studio to launch the app from IIS ? — NicoD
– NicoD, Commented Jun 24, 2014 at 12:41

Arun Bertil · Accepted Answer · 2014-06-25 05:29:57Z

1

Here's step by step a procedure which is ok from my VS2013, on a 64Bits OS

Create a blank app : New project type WebApplication > WebForm (or else) > no authentication
Target x64 : for the Debug mode from drop down list
- Choose configuration manager
- Choose platform new and select x64 as target platform
From the properties of your project, in the web tab
- Choose Local IIS instead of IIS Express
- Create Virtual Directory => The virtual directory was successfully created
Launch the app in debug mode from visual studio

edited Jun 25, 2014 at 5:29

Arun Bertil

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answered Jun 24, 2014 at 12:59

NicoD

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Rameez · Accepted Answer · 2014-07-03 07:38:46Z

0

This is the steps to debug your application in x64 bit environment in Visual Studio.

In the Project Properties 'Build' Tab change the setting 'Platform Target = x64'
And for web application in the 'Web' Tab Select the Option 'Use Local IIS Web Server'
Then click 'Create Virtual Directory'
Make sure your IIS application pool setting 'Enable 32-Bit Applications = False' (By default it is false only).

Then debug.

answered Jul 3, 2014 at 7:38

Rameez

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