DLLimport and Entrypoint not found problem

[pfritz28]

I made a simple dll written in vb6

Public Static Function TEST(ByVal x As Integer)
 
On Error GoTo error
 
    MsgBox ("aaa")
    Exit Function
    
error:
   TEST = 0
End Function

I compiled and then made a c# project to use it

using System;
using System.Security;
using System.Security.Permissions;
using System.Runtime.InteropServices;
using System.Windows.Forms;

namespace teste
{
	class NativeMethods
	{
		[SuppressUnmanagedCodeSecurityAttribute()]
		[DllImport("C:\\TEST.dll")]
		extern public static int TEST(int x);
	}

	class MainClass
	{
		[SecurityPermission(SecurityAction.Deny, Flags = 
			 SecurityPermissionFlag.UnmanagedCode)]
		public void CallUnmanagedCodeWithPermission()
		{
			try
			{
				NativeMethods.TEST(1);
				MessageBox.Show("OK");
			}
			catch (SecurityException e)
			{
				MessageBox.Show("ERROR:" + e.Source + e.Message);
			}
		}
	}
}

When i run the exe it gives me an error

An unhandled exception of type 'System.EntryPointNotFoundException' occurred in teste.exe

Additional information: Unable to find an entry point named TEST in DLL C:\TEST.dll.

Any ideas how to solve this .

Thanks