C++ dll works in C# console app however gives error in C# UWP app

I am getting following error when I try to use a function from DLL written in C++ in my C# UWP App. i can call same DLL in C# console application without any issues. I am not experienced in working with dll/dependencies. Really appreciate your help.

ERROR in C# UWP App:: System.DllNotFoundException: 'Unable to load DLL 'WOOF.dll' or one of its dependencies: The specified module could not be found. (Exception from HRESULT: 0x8007007E)'

Below Program works without any issues.

//Program.cs file - single file C# console program that imports WOOF C++ DLL. Function 'FnWoof() only returns 42
    using System;
    using System.Runtime.InteropServices;
    namespace ConsoleAppCsharp1
    {
        class Program
        {

            [DllImport("WOOF", CallingConvention = CallingConvention.Cdecl)]

            static extern int fnWoof();


            static void Main(string[] args)
            {

                int reply = fnWoof();
                Console.WriteLine(reply);
                Console.WriteLine("Hello World!");



            }
        }
    }

UWP app code- does not work. get unable to load DLL error listed above :

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Runtime.InteropServices.WindowsRuntime;
using Windows.Foundation;
using Windows.Foundation.Collections;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Controls.Primitives;
using Windows.UI.Xaml.Data;
using Windows.UI.Xaml.Input;
using Windows.UI.Xaml.Media;
using Windows.UI.Xaml.Navigation;
using System.Runtime.InteropServices;



namespace UWPapp
{
    /// <summary>
    /// An empty page that can be used on its own or navigated to within a Frame.
    /// </summary>
    public sealed partial class UnitTests : Page
    {
        [DllImport("WOOF.dll", CallingConvention = CallingConvention.Cdecl)]
        public static extern int fnWoof();
        public UnitTests()
        {
            this.InitializeComponent();
        }

        private void displayfromdll_Click(object sender, RoutedEventArgs e)
        {
            int reply=fnWoof();

            result.Text = reply.ToString();


        }
    }
}

Woof DLL code

Woof.h

//Woof.h 
#ifdef WOOF_EXPORTS
#define WOOF_API __declspec(dllexport)
#else
#define WOOF_API __declspec(dllimport)
#endif


extern "C" {
    WOOF_API int _cdecl fnWoof(void);
}

Woof.cpp

//Woof.cpp
    #include "pch.h"
    #include "framework.h"
    #include "Woof.h"




    // This is an example of an exported function.
    WOOF_API int fnWoof(void)
    {
        return 42;
    }

dllmain.cpp

//dllmain.cpp
#include "pch.h"

BOOL APIENTRY DllMain( HMODULE hModule,
                       DWORD  ul_reason_for_call,
                       LPVOID lpReserved
                     )
{
    switch (ul_reason_for_call)
    {
    case DLL_PROCESS_ATTACH:
    case DLL_THREAD_ATTACH:
    case DLL_THREAD_DETACH:
    case DLL_PROCESS_DETACH:
        break;
    }
    return TRUE;
}

Reproducible example: https://github.com/qaftab/Reproducible-example