memmory problem

im my project the memmory usage begines with 9200k and goes to 150000Mb!!

why?

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Text;

using System.Windows.Forms;

using System.IO.Ports;

using System.Text.RegularExpressions;

namespace SimpleSerial

public partial class Form1 : Form

// Add this variable

string RxString;

public string displine1;

public string displine2;

public Form1()

serialPort1.PortName = "COM5";

this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.None; //eksafanizei ta pano button tis formas

//this.TopMost = true; //me true always on top i forma

//WindowState = FormWindowState.Maximized; //i forma na einai form maximize

//orizoume syntetagmenes tou position

int monitorHeight;

int monitorWidth;

int monitorcenterHeight;

int monitorcenterWidth;

int formposition;

monitorHeight = SystemInformation.PrimaryMonitorSize.Height; //pernoume stin metavliti monitorHeight to Height tis trexousas analisis tis othonis

monitorWidth = SystemInformation.PrimaryMonitorSize.Width; //pernoume stin metavliti monitorWidth to Width tis trexousas analisis tis othonis

monitorcenterHeight = monitorHeight / 2; // to dieroume /2 gia na broume to kentro

this.StartPosition = FormStartPosition.Manual; //energopioume manual position

this.Location = new Point(formposition, 0);

if (!CheckIfPortExists(serialPort1.PortName))

MessageBox.Show(serialPort1.PortName + " doesn't exist on this computer");

else

try

catch (Exception ex)

MessageBox.Show(ex.Message);

//MessageBox.Show("Serial port in use");

private bool CheckIfPortExists(string portName)

foreach (string name in SerialPort.GetPortNames())

if (name == portName) return true;

return false;

private void DisplayText(object sender, EventArgs e)

foreach (string strItem in Regex.Split(RxString, "#2#"))

private void serialPort1_DataReceived(object sender, System.IO.Ports.SerialDataReceivedEventArgs e)

System.GC.Collect(); //meionei tin mnimi kai kanei suspent to thread

System.GC.WaitForPendingFinalizers();

////RxString = serialPort1.ReadExisting();

//meionei tin mnimi kai kanei suspent to thread

this.Invoke(new EventHandler(DisplayText));