C / C++ / MFC

void CListControlDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	DDX_Control(pDX, IDC_LIST, m_List);
}

BEGIN_MESSAGE_MAP(CListControlDlg, CDialog)
	.
	.
	.
	ON_BN_CLICKED(IDC_BUTTON1, OnBnClickedAdd)
	ON_BN_CLICKED(IDC_BUTTON2, OnBnClickedRemove)
END_MESSAGE_MAP()

BOOL CListControlDlg::OnInitDialog()
{
   .
   .
   .
   // TODO: Add extra initialization here
   m_Count = 1;
}

void CListControlDlg::OnBnClickedAdd()
{
	// TODO: Add your control notification handler code here
	//Add 1000 colums in List Control
	int max_limit = m_Count + 1000;
	CString columnstr = "Column";
	CString Columnno = "";
	for (int i = m_Count; i <= max_limit; i++)
	{
		Columnno.Format("%d", i);
		CString columnstrTemp = columnstr + Columnno;
		m_List.InsertColumn(i, columnstrTemp, LVCFMT_LEFT, 80);
	}
	m_Count = max_limit;
}

void CListControlDlg::OnBnClickedRemove()
{
	// TODO: Add your control notification handler code here
	//Removes 1000 colums in List Control
	int max_limit = m_Count - 1000;
	CString columnstr = "Column";
	CString Columnno = "";
	for (int i = m_Count; i >= max_limit - 1; i--)
	{
		Columnno.Format("%d", i);
		CString columnstrTemp = columnstr + Columnno;
		m_List.DeleteColumn(i);
	}
	m_Count = max_limit;
}

class CListControlDlg : public CDialog
{
   .
   .
   .
   .
private:
	CListCtrl m_List;
	int m_Count;
public:
	afx_msg void OnBnClickedAdd();
	afx_msg void OnBnClickedRemove();
}

IDD_LISTCONTROL_DIALOG DIALOGEX 0, 0, 501, 289
STYLE DS_SETFONT | DS_MODALFRAME | DS_3DLOOK | DS_FIXEDSYS | WS_MAXIMIZEBOX | 
    WS_POPUP | WS_VISIBLE | WS_CAPTION | WS_SYSMENU
EXSTYLE WS_EX_APPWINDOW
FONT 8, "MS Shell Dlg", 0, 0, 0x1
BEGIN
    DEFPUSHBUTTON   "OK",IDOK,444,7,50,16
    PUSHBUTTON      "Cancel",IDCANCEL,389,7,50,16
    CTEXT           "TODO: Place dialog controls here.",IDC_STATIC,7,174,300,
                    8
    CONTROL         "",IDC_LIST,"SysListView32",LVS_REPORT | LVS_ALIGNLEFT | 
                    WS_BORDER | WS_TABSTOP,27,30,454,236,WS_EX_CLIENTEDGE | 
                    WS_EX_LEFTSCROLLBAR
    PUSHBUTTON      "Add",IDC_BUTTON1,247,7,50,14
    PUSHBUTTON      "Remove",IDC_BUTTON2,311,7,50,14
END