Open SharpDevelop with Unity Editor

using System;
using System.Diagnostics;
using System.IO;

namespace UnityStartSharpDevelop
{
    class Program
    {
        public static void Main(string[] args)
        {
            /* From Unity Docs https://docs.unity3d.com/Manual/Preferences.html
            $(ProjectPath) is replaced with the path to the open project.
            Unity "$(ProjectPath) sends X:\PathToYourProject e.g C:\Users\graha\Dropbox\Computer Club\Unity\Brackeys Youtube Tutorial\
            The project .sln file created by Unity/VS is in this folder with the same name as the project: Brackeys Youtube Tutorial.sln
            Compile this project and place 'UnityStartSharpDevelop.exe' somewhere in the Unity installation folder.
            Browse Unity preferences to use this file as the external editor.
            Any C# file in your unity project will load the entire solution with all .cs files available.
            Navigate the project to edit the script you are looking for
            */

            // If SharpDevelop is already running, prevent a second instance starting
            string processName = "SharpDevelop";
            Process[] instances = Process.GetProcessesByName(processName);
            if (instances.Length > 1)
            {
                Environment.Exit(1);
            }

            //Edit this path to SharpDevelop to suit your system
            const string sharpDevelopAppPath = @"C:\Program Files (x86)\SharpDevelop\5.1\bin\SharpDevelop.exe";
            string projectPath = string.Empty;
            string projectName = string.Empty;
            if(args.Length > 0) //Check args have been passed
            {
                projectPath = args[0];
                projectName = new DirectoryInfo(projectPath).Name + ".sln";
                projectPath = Path.Combine(projectPath, projectName);
                if(File.Exists(projectPath))
                {
                    projectPath = "\"" + projectPath + "\""; // surround pathname with quotes to prevent spaces causing errors
                    try
                    {
                        ProcessStartInfo start = new ProcessStartInfo();
                        start.Arguments = projectPath;
                        start.FileName = sharpDevelopAppPath;
                        Process.Start(start);
                    }
                    catch (Exception ex)
                    {
                        Console.WriteLine(ex.Message);
                        ExitApp();
                    }
                }
                else //file does not exist
                {
                    Console.WriteLine("Solution file " + projectPath + "Not found. Please set Unity External Editor arguments to use '$(ProjectPath)");
                    Console.WriteLine("Also make sure the solution name has the same name as the project directory.");
                    ExitApp();
                }
            }
            else //no args passed
            {
                Console.WriteLine("No args found. Please set Unity External Editor arguments to use '$(ProjectPath)");
                ExitApp();
            }
        }
        private static void ExitApp()
        {
            Console.Write("Press any key to exit . . . ");
            Console.ReadKey(true);
        }
    }
}