C#

m_SerialPort = new SerialPort("COM1",2400,Parity.None,8,StopBits.One);
m_SerialPort.DtrEnable = true;
m_SerialPort.RtsEnable = true;
m_SerialPort.Open();

m_SerialPort.DataReceived += new SerialDataReceivedEventHandler(m_SerialPort_DataReceived);

void m_SerialPort_DataReceived(object sender, SerialDataReceivedEventArgs e)
{
    txtInput.Text += " " + m_SerialPort.ReadExisting();
}

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

public partial class Default2 : System.Web.UI.Page
{
	// from http://www.codeproject.com/useritems/Remember_me_next_time.asp
    protected void Page_Load(object sender, EventArgs e)
    {
		if (!IsPostBack)
		{
			if (Request.Cookies["LoginCookie"] != null)
			{
				HttpCookie cookie = Request.Cookies.Get("LoginCookie");
				this.Login1.UserName = cookie.Values["ID"].ToString();
//				string password = cookie.Values["Pass"].ToString();
//				if (Membership.ValidateUser(emailID, password))
//				{
//					FormsAuthentication.RedirectFromLoginPage(emailID, true);
//				}
			}
		}
    }
	protected void Login1_LoggedIn(object sender, EventArgs e)
	{
		CheckBox rm = (CheckBox)Login1.FindControl("RememberMe");

		if (rm.Checked)
		{
			HttpCookie myCookie = new HttpCookie("LoginCookie");
			Response.Cookies.Remove("LoginCookie");
			Response.Cookies.Add(myCookie);
			myCookie.Values.Add("ID", this.Login1.UserName.ToString());
//			myCookie.Values.Add("Pass", this.Login1.Password.ToString());
			DateTime dtExpiry = DateTime.Now.AddDays(15); //you can add years and months too here
			Response.Cookies["LoginCookie"].Expires = dtExpiry;
		}
	}
}

Process proc=new Process();
proc.StartInfo.FileName="my command";
proc.StartInfo.Arguments="my command arguments";
proc.StartInfo.CreateNoWindow=true;
proc.StartInfo.UseShellExecute=true;
proc.Start();

pashje wrote:

isn't it possible to set a registry value when you start your app and reset the value when you exit ? And if that registry value is empty the folder may not open ?

pashje wrote:

I am searching for a couple of hours but found nothing

pashje wrote:

There must be something, and I am ready to spend my weeks on this topic...

void OpenImageViewer(string f) {
    Process proc=new Process();
    proc.StartInfo.FileName=@"C:\WINDOWS\system32\rundll32.exe";
    proc.StartInfo.Arguments=@"C:\WINDOWS\system32\shimgvw.dll,ImageView_Fullscreen "+f;
    proc.StartInfo.UseShellExecute=true;
    proc.Start();
}

void OpenDefaultTool(string f) {
    Process proc=new Process();
    proc.StartInfo.FileName=f;
    proc.StartInfo.Arguments=null;
    proc.StartInfo.UseShellExecute=true;
    proc.Start();
}