C#

using System;
using System.Collections.Generic;
using System.Text;
using Microsoft.Win32;
using System.Windows.Forms;
namespace ClientName.Sources
{
    class Autostart
    {
        public string errorMsg;
        public string ErrorMsg
        {
            get { return errorMsg; }
            set { errorMsg = value; }
        }
        public string value;
        public string Value
        {
            get { return value; }
            set { this.value = value; }
        }
        /// <summary>
        /// Class variables, the default filename.
        /// </summary>
        const string filename = "MyCSharpApplication";
        RegistryKey start;
        /// <summary>
        /// Writes values to autostart, will add feature to add a service.
        /// maybe windows signed?
        /// </summary>
        public void WriteAutoStart()
        {
            try
            {
                string RUN_LOCATION = @"SOFTWARE\MICROSOFT\WINDOWS\CURRENTVERSION\RUN";
                start = Registry.LocalMachine.CreateSubKey(RUN_LOCATION, Microsoft.Win32.RegistryKeyPermissionCheck.ReadWriteSubTree);  
                bool ifExist = ifExists();
                while (ifExist == false)
                {
                    start.SetValue(filename, Application.ExecutablePath.ToString());
                    start.Close();
                    ifExist = true;
                }
            }
            catch (Exception ee)
            {
                ErrorMsg = ee.Message;
            }
        }
        public bool ifExists()
        {
            if (start.GetValue(filename) == null)
                return false; //firstRun
            else return true; //exists
        }
    }
}