DLLNotFoundException in C# runtime

I got a DLLNotFound Exception when I ran my C# program, the DLL is n the \Windows\System32\

and I have wrapper functions being used.  Is there other configuration i need to be do to access functions withing the dll.

using System.Runtime.InteropServices;
 
namespace TS_GlobalVariables
{
    public class TS
    {
        [DllImport("GlobalVariable.dll", EntryPoint = "GV_SetInteger")]
        public static extern int GV_SetInteger(int iLocation, int iVal);

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