ControlVolume/ControlVolume/NativeMethods/User32.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;

namespace ControlVolume.NativeMethods
{
    class User32
    {
        [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
        public static extern IntPtr SendMessage(IntPtr hWnd, uint Msg, uint wParam, uint lParam);

    }
}