How to create the timer without refreshing the text box

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C++

VisualC++

I am using the Timer in my application. I displayed the current system time and currently running application time using the SetTimer(1,999,NULL). I created one text box and start button.
When I enter the integer value in the text box (ex: 10) and press the start button, the message box should pop-up after 10 seconds. For this I created another SetTimer(2,m_Sec*1000,NULL). Everything was fine but when I execute the application for every sec the text box is refreshed.
I can't enter the value in that text box.

What changes I have to make.

Here is my code.

m_Sec is the UINT variable of the text box.

// TickCounterDlg.cpp : implementation file
//

#include "stdafx.h"
#include "TickCounter.h"
#include "TickCounterDlg.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#endif

// CTickCounterDlg dialog

CTickCounterDlg::CTickCounterDlg(CWnd* pParent /*=NULL*/)
	: CDialog(CTickCounterDlg::IDD, pParent)
	, m_Comp(_T(""))
	, m_App(_T(""))
	, m_Sec(0)
{
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void CTickCounterDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	DDX_Control(pDX, IDC_COMP_TIME, m_CompTime);
	DDX_Control(pDX, IDC_APP_TIME, m_AppTime);
	DDX_Text(pDX, IDC_COMP_TIME, m_Comp);
	DDX_Text(pDX, IDC_APP_TIME, m_App);

	DDX_Text(pDX, IDC_SEC, m_Sec);
}

BEGIN_MESSAGE_MAP(CTickCounterDlg, CDialog)
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	//}}AFX_MSG_MAP
	ON_WM_TIMER()
	
	ON_BN_CLICKED(IDC_START, &CTickCounterDlg::OnBnClickedStart)
END_MESSAGE_MAP()


// CTickCounterDlg message handlers

BOOL CTickCounterDlg::OnInitDialog()
{
	CDialog::OnInitDialog();

	// Set the icon for this dialog.  The framework does this automatically
	//  when the application's main window is not a dialog
	SetIcon(m_hIcon, TRUE);			// Set big icon
	SetIcon(m_hIcon, FALSE);		// Set small icon

	// TODO: Add extra initialization here
	CompTime = CTime::GetTickCount();
SetTimer(1, 999, NULL);
SetTimer(2,10000,NULL);
	return TRUE;  // return TRUE  unless you set the focus to a control
}

// If you add a minimize button to your dialog, you will need the code below
//  to draw the icon.  For MFC applications using the document/view model,
//  this is automatically done for you by the framework.

void CTickCounterDlg::OnPaint()
{
	if (IsIconic())
	{
		CPaintDC dc(this); // device context for painting

		SendMessage(WM_ICONERASEBKGND, reinterpret_cast<wparam>(dc.GetSafeHdc()), 0);

		// Center icon in client rectangle
		int cxIcon = GetSystemMetrics(SM_CXICON);
		int cyIcon = GetSystemMetrics(SM_CYICON);
		CRect rect;
		GetClientRect(&rect);
		int x = (rect.Width() - cxIcon + 1) / 2;
		int y = (rect.Height() - cyIcon + 1) / 2;

		// Draw the icon
		dc.DrawIcon(x, y, m_hIcon);
	}
	else
	{
		CDialog::OnPaint();
	}
}

// The system calls this function to obtain the cursor to display while the user drags
//  the minimized window.
HCURSOR CTickCounterDlg::OnQueryDragIcon()
{
	return static_cast<hcursor>(m_hIcon);
}


void CTickCounterDlg::OnTimer(UINT_PTR nIDEvent)
{
	// TODO: Add your message handler code here and/or call default
// TODO: Add your message handler code here and/or call default
if(nIDEvent==1)
{
	CTime CurTime=CTime::GetTickCount();
	CTimeSpan Difference=CurTime-CompTime;
	unsigned int compHour,compMin,compSec;
	unsigned int curSec,curMin,curHour;
	compHour=Difference.GetHours();
	compMin=Difference.GetMinutes();
	compSec=Difference.GetSeconds();
	curHour=CurTime.GetHour();
	curMin=CurTime.GetMinute();
	curSec=CurTime.GetSecond();
m_Comp.Format(L"This computer current Time is %d hours, %d minutes %d seconds", curHour, curMin, curSec);
m_App.Format(L"This application has been running for %d hours, %d minutes %d seconds", compHour, compMin, compSec);
}
if(nIDEvent==2)
{
MessageBox(L"hai");
KillTimer(2);
}
UpdateData(FALSE);
CDialog::OnTimer(nIDEvent);
}


void CTickCounterDlg::OnBnClickedStart()
{
	// TODO: Add your control notification handler code here
	UpdateData();
	SetTimer(2,m_Sec*1000,NULL);
}