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Running 2 instances of solutions/projects of C# in VS 2010.

Posted on 2011-03-08
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Last Modified: 2012-05-11
Hi there;

I need to run 2 instances of the same solution of C# in VS 2010. When I try for it, it fails as the related file is already in use. Is there a workaround?

Kind regards.
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Question by:jazzIIIlove
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Expert Comment

by:Carl Tawn
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You could try setting one build to Release and the other to Debug. That way they will run from two different output folders.
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by:jazzIIIlove
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ok, then I don't want to exagerrate but what about more than 2? (curiousity?)

Kind regards.
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Expert Comment

by:Carl Tawn
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You should be able to browse to the bin/Debug or bin/Release and run directly from there. You won't get debugger support but it should run.
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by:jazzIIIlove
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I need that debugger support, as I have to check both executions whether they interact/block/lock each other.

No way?

Kind regards.
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Accepted Solution

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Todd Gerbert earned 500 total points
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You can start the processes manually, and then attach a debugger from Visual Studio separately.  Put something in your Program.cs to pause program execution so you have time to attach the debugger before anything interesting happens in your program, for example:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows.Forms;

namespace WindowsFormsApplication1
{
    static class Program
    {
        /// <summary>
        /// The main entry point for the application.
        /// </summary>
        [STAThread]
        static void Main()
        {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
#if DEBUG
            MessageBox.Show(String.Format("Attach debugger to process ID {0} now, then click OK to continue.",
                System.Diagnostics.Process.GetCurrentProcess().Id));
#endif
            Application.Run(new Form1());
        }
    }
}

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Start two instances of Visual Studio, open the same project in each.

Navigate to the "Bin\Debug" folder of your application in Windows, and manually run the .EXE.

In Visual Studio instance #1 click on the Debug menu, and select Attach to Process...  Select the appropriate process.

Go back to the Bin\Debug folder in Windows, and run your .EXE a second time.

In Visual Studio instance #2, attach to the process of the second .EXE.

I don't think you can do this with Express editions of Visual Studio.
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Author Comment

by:jazzIIIlove
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>>carl_tawn:
You solve it but:

>>tgerbert:
Astonishing and breathtaking. I will try for it before concluding this question.

Kind regards.
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