program stops responding when in a busy loop

Hi,

I have a program which inside a loop does some encryption/decryption till the battery level on my laptop goes down by some percentage. However, the problem is that it simply stops responding some time in between. I had a similar code for PocketPc which was fine. I believe it has something to do with the fact that my code is busy waiting(not actually waiting but doing computations in a loop) and would not respond to other events. I say so coz I got an error during one of the previous runs saying something similar. Please help. My code is as below:

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Text;

using System.Windows.Forms;

using System.Security.Cryptography;

using System.IO;

using System.Runtime.InteropServices;

namespace WindowsApplication1

{

public partial class Form1 : Form

{

String plaintext = //some plaintext
String enctext = "";
String dectext = "";

SymmetricAlgorithm mCryptoService;

public Form1()

{

InitializeComponent();

mCryptoService = new DESCryptoServiceProvider();

mCryptoService.GenerateIV();

mCryptoService.GenerateKey();

}

private void start_Click(object sender, EventArgs e)

{

DateTime startTime, stopTime;

TimeSpan duration;

float decrease = 0.25F, initial = 0, start, end;

long counter = 0;

initial = SystemInformation.PowerStatus.BatteryLifePercent;

percent.Text = String.Format("{0}%", initial);

//wait till u go 1 percent down

status.Text = "computations will start...";

while (true)

{

if (SystemInformation.PowerStatus.BatteryLifePercent != initial)

break;

}

start = SystemInformation.PowerStatus.BatteryLifePercent;

percent.Text = String.Format("{0}%", start);

end = start - decrease;

status.Text = "computations started";

/* Read the initial time. */

startTime = DateTime.Now;

while (SystemInformation.PowerStatus.BatteryLifePercent != end)

{

enctext = "";

dectext = "";

if (Encrypt() != 0)

status.Text = "encryption error";

if (Decrypt() != 0)

status.Text = "decryption error";

enctext = "";

dectext = "";

if (Encrypt() != 0)

status.Text = "encryption error";

if (Decrypt() != 0)

status.Text = "decryption error";

counter = counter + 2;

count.Text = counter.ToString();

percent.Text = String.Format("{0}%", SystemInformation.PowerStatus.BatteryLifePercent);

Refresh();

}

status.Text = "Done";

stopTime = DateTime.Now;

duration = stopTime - startTime;

time.Text = duration.ToString();

}

private int Encrypt()

{
//some encryption
}

private int Decrypt()

{

//some decryption
}

}

}