EmployeeTracker/InvestTracker/Commands/DataCommands.cs

using Prism.Commands;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace InvestTracker.Commands
{
    public class DataCommands
    {
        public static DelegateCommand ExitCommand { get; set; }

        static DataCommands()
        {
            ExitCommand = new DelegateCommand(ExitCommandExecuted);
        }

        public static void ExitCommandExecuted()
        {
            App.Current.Shutdown();
        }
    }
}