frmSettings.cs

using System;
using System.IO;
using System.Windows.Forms;
using DCS_Module_Manager.Properties;

namespace DCS_Module_Manager
{
    public partial class FrmSettings : Form
    {
        public FrmSettings()
        {
            InitializeComponent();
        }

        private void btnSave_Click(object sender, EventArgs e)
        {
            bool anyFail = false;
            string dcsInstallPath = txtPath.Text;
            if (validateInstallPath(dcsInstallPath))
            {
                Settings.Default.dcsInstallPath = dcsInstallPath;
            }
            else
            {
                txtPath.Text = "";
                anyFail = true;
            }
            
            Settings.Default.Save();

            if (!anyFail)
            {
                Close();
            }
        }

        private bool validateInstallPath(string path)
        {
            if (!Directory.Exists(path))
            {
                MessageBox.Show(@"Install Path: Folder does no exist", @"Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
                return false;
            }

            string dcsUpdaterPath = $@"{path}\Bin\DCS_Updater.exe";
            if (!File.Exists(dcsUpdaterPath))
            {
                MessageBox.Show(@"Install Path: Cannot find DCS_Updater.exe", @"Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
                return false;
            }

            return true;
        }

        private void FrmSettings_Load(object sender, EventArgs e)
        {
            Settings.Default.Reload();
            
            txtPath.Text = Settings.Default.dcsInstallPath;
        }
    }
}