BadImageFormatException

I am creating a c# program using a dll called GlobalVariable.dll in windows\system32.
I gave me an exception when I using a function within a dll. Can anyone tell me if there is more I need to setup the environment or tips how to resolve this problem. The code is the wrapper code the dll. The attachment is the snapshot during debugging.
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Runtime.InteropServices;
 
namespace TSGlobalVariables
{
    public class TS
    {
        [DllImport("GlobalVariable.dll", EntryPoint = "GV_SetInteger")]
        public static extern int GV_SetInteger(int iLocation, int iVal);
        [DllImport("GlobalVariable.dll", EntryPoint = "GV_GetInteger")]
        public static extern int GV_GetInteger(int iLocation);
        [DllImport("GlobalVariable.dll", EntryPoint = "GV_SetDouble")]
        public static extern int GV_SetDouble(int iLocation, double dVal);
        [DllImport("GlobalVariable.dll", EntryPoint = "GV_GetDouble")]
        public static extern double GV_GetDouble(int iLocation);
    }
}

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BadImageFormatException.jpg
xewooxAsked:
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Todd GerbertConnect With a Mentor IT ConsultantCommented:
The error message would seem to suggest your DLL is not really a DLL (or is a 64-bit DLL on a 32-bit system, or vice versa).

I Googled "BadImageFormatException" and first on the results list:

http://msdn.microsoft.com/en-us/library/system.badimageformatexception.aspx
This exception is thrown when the file format of a dynamic link library (.dll file) or an executable (.exe file) does not conform to the format that is expected by the common language runtime.
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xewooxAuthor Commented:
Good answer, right to the point.
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