ASP.Net c# calling c++ unmanaged DLL

[will]

hi,

i'm trying to

(1)create a unmanaged c++ DLL
=============================================
extern "C" __declspec(dllexport) __cdecl int sum(int a,int b); ---->
compiled okay to mysum.dll
=============================================

(2)create a namespace/class to DllImport the above DLL
=============================================
using System.Runtime.InteropServices;
namespace ImportDLL
{
public class importdll
{
public importdll()
{
}

DllImport("mysum.dll",
EntryPoint="sum",ExactSpelling=false,CallingConvention=CallingConvention.Cdecl)]
public static extern int myfun(int a, int b);
}
}
=============================================

(3)create a aspx code behind
=============================================
using ImportDLL;
namespace TEST
{
...
...
...

public int my_result;
protected importdll imp = new importdll();
my_result = imp.myfun(1,1);
}
=============================================

when i run the aspx page, i got the following error:

CS0118: 'TEST.imp' denotes a 'field' where a 'class' was expected
error line is "content = imp.myfun(1,1);"


basically i want to call a c++ function which returns a value, which i
can subsequently assign to a variable. what have i done wrong?

thanks

will.

 

[Vadym Stetsyak]

your p/invoke method is static you should call it with importdll.myfun(1,1)