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using System.IO.Ports;
using System.Text;
using System;
namespace RS232_win
{
    partial class Form1
    {
        SerialPort port = new SerialPort();
        /// <summary>
        /// Erforderliche Designervariable.
        /// </summary>
        private System.ComponentModel.IContainer components = null;
        public string test;
        /// <summary>
        /// Verwendete Ressourcen bereinigen.
        /// </summary>
        /// <param name="disposing">True, wenn verwaltete Ressourcen gelöscht werden sollen; andernfalls False.</param>
        protected override void Dispose(bool disposing)
        {
            if (disposing && (components != null))
            {
                components.Dispose();
            }
            base.Dispose(disposing);
        }

        #region Vom Windows Form-Designer generierter Code

        /// <summary>
        /// Erforderliche Methode für die Designerunterstützung.
        /// Der Inhalt der Methode darf nicht mit dem Code-Editor geändert werden.
        /// </summary>
        private void InitializeComponent()
        {
            this.textBox1 = new System.Windows.Forms.TextBox();
            this.button1 = new System.Windows.Forms.Button();
            this.button2 = new System.Windows.Forms.Button();
            this.label1 = new System.Windows.Forms.Label();
            this.SuspendLayout();
            // 
            // textBox1
            // 
            this.textBox1.BackColor = System.Drawing.SystemColors.ActiveCaptionText;
            this.textBox1.Location = new System.Drawing.Point(79, 69);
            this.textBox1.Multiline = true;
            this.textBox1.Name = "textBox1";
            this.textBox1.ReadOnly = true;
            this.textBox1.ScrollBars = System.Windows.Forms.ScrollBars.Vertical;
            this.textBox1.Size = new System.Drawing.Size(277, 208);
            this.textBox1.TabIndex = 0;
            this.textBox1.TextChanged += new System.EventHandler(this.textBox1_TextChanged);
            // 
            // button1
            // 

            this.button1.Location = new System.Drawing.Point(67, 314);
            this.button1.Name = "button1";
            this.button1.Size = new System.Drawing.Size(122, 28);
            this.button1.TabIndex = 1;
            this.button1.Text = "Connect";
            this.button1.UseVisualStyleBackColor = true;
            this.button1.Click += new System.EventHandler(this.button1_Click);
            // 
            // button2
            // 
            this.button2.Location = new System.Drawing.Point(234, 314);
            this.button2.Name = "button2";
            this.button2.Size = new System.Drawing.Size(122, 28);
            this.button2.TabIndex = 2;
            this.button2.Text = "Disconnect";
            this.button2.UseVisualStyleBackColor = true;
            this.button2.Click += new System.EventHandler(this.button2_Click);
            // 
            // label1
            // 
            this.label1.AutoSize = true;
            this.label1.Location = new System.Drawing.Point(99, 13);
            this.label1.Name = "label1";
            this.label1.Size = new System.Drawing.Size(35, 13);
            this.label1.TabIndex = 3;
            this.label1.Text = "label1";
            // 
            // Form1
            // 
            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.ClientSize = new System.Drawing.Size(454, 354);
            this.Controls.Add(this.label1);
            this.Controls.Add(this.button2);
            this.Controls.Add(this.button1);
            this.Controls.Add(this.textBox1);
            this.Name = "Form1";
            this.Text = "Form1";
            this.Load += new System.EventHandler(this.Form1_Load);
            this.Activated += new System.EventHandler(this.Form1_Activated);
            this.ResumeLayout(false);
            this.PerformLayout();

        }

        public void teststart()
        {
            SerialPort port = new SerialPort();
            Form1 form1 = new Form1();
            port.PortName = "COM4";
            port.BaudRate = 38400;
            port.Parity = Parity.None;
            port.DataBits = 8;
            port.StopBits = StopBits.One;
            port.Encoding = Encoding.ASCII;
            port.DtrEnable = true;
            port.RtsEnable = true;
            port.ReceivedBytesThreshold = 20;
            port.DataReceived += new SerialDataReceivedEventHandler(port_DataReceived);
            port.Open();







            

        }
        public void testend()
        {
            port.Close();
        }
        public void port_DataReceived(object sender, SerialDataReceivedEventArgs e)
        {

            textBox1.Text=port.ReadExisting();


        }

        #endregion

        private System.Windows.Forms.TextBox textBox1;
        private System.Windows.Forms.Button button1;
        private System.Windows.Forms.Button button2;
        private System.Windows.Forms.Label label1;
    }
}					

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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.IO.Ports;

namespace RS232_win
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            
        }

        
        private void button1_Click(object sender, EventArgs e)
        {
            teststart();
        }

        private void button2_Click(object sender, EventArgs e)
        {
            testend();
        }

        private void textBox1_TextChanged(object sender, EventArgs e)
        {

        }

        private void Form1_Load(object sender, EventArgs e)
        {
            
        }

        private void Form1_Activated(object sender, EventArgs e)
        {
            
        }

        private void checkBox1_CheckedChanged(object sender, EventArgs e)
        {

        }
    }
}