C#

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        [DllImport("USER32.DLL", CharSet = CharSet.Unicode)]
        public static extern IntPtr FindWindow(string lpClassName,
            string lpWindowName);

        [DllImport("USER32.DLL")]
        public static extern bool SetForegroundWindow(IntPtr hWnd);

        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {

            IntPtr SpotHandle = FindWindow("SpotifyMainWindow", null);

            if (SpotHandle == IntPtr.Zero)
            {
                MessageBox.Show("Spotify är ej igång");
                return;
            }
            SetForegroundWindow(SpotHandle);
            //Skicka space
            SendKeys.SendWait("{SPACE}");            
        }
    }
}

public class DeckManagement: Form

public class DeckManagement: WarGame
//WarGame is the name of the class inside form1