WM_PAINT перестает перерисовывать окно

InvalidateRect(hWnd, NULL, TRUE);

#include <iostream>
#include <windows.h>
#include <ctime>  
 
// time_t ntime;
unsigned ntime;
RECT rc;
RECT r; 
 
LRESULT CALLBACK DCDemoWndProc(HWND hWnd, UINT Message, UINT wParam, LONG lParam) {
    HDC hdc;
    PAINTSTRUCT PaintStruct;
    SetTimer(hWnd,1,30,NULL);
 
char buffer[256] ="time: "; 
char temp[128];
 
    switch (Message) { 
 
case WM_TIMER: 
ntime++;
    InvalidateRect(hWnd,&rc,false);
    break;
                             
case WM_PAINT : 
 
hdc = BeginPaint (hWnd, &PaintStruct);
SetRect(&rc, 0, 0, 500, 500);
 
            
SetRect(&r, 500, 0, 600, 500);
FillRect(hdc, &r, HBRUSH(CreateSolidBrush(RGB(25,25,25))));
FillRect(hdc, &rc, HBRUSH(CreateSolidBrush(RGB(0,0,0))));
 
sprintf_s(temp, "%d",ntime);
strcat(buffer,temp);
TextOut(hdc, 20, 270, buffer, 25);
EndPaint(hWnd,&PaintStruct);    
 break;
 
       case WM_DESTROY :
            PostQuitMessage(0);
            return 0;
    }
    return DefWindowProc(hWnd, Message, wParam, lParam);
}
 
 
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpszCmdParam, int nCmdShow) {
        
    HWND hWnd;
    WNDCLASS WndClass;
    MSG Msg;
    char szClassName[] = "DCDemo";
 
 
    /* Регистрация класса окна */
    /* Заполнение структуры WNDCLASS */
    WndClass.style = CS_HREDRAW | CS_VREDRAW;
    WndClass.lpfnWndProc = DCDemoWndProc;
    WndClass.cbClsExtra = 0;
    WndClass.cbWndExtra = 0;
    WndClass.hInstance = hInstance;
    WndClass.hIcon = LoadIcon(NULL, IDI_APPLICATION);
    WndClass.hCursor = LoadCursor(NULL, IDC_ARROW);
    WndClass.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
    WndClass.lpszMenuName = "MyMenu";
    WndClass.lpszClassName = szClassName;
    
 
    if ( !RegisterClass(&WndClass) ){
        MessageBox(NULL, "Can't register class!", "ERROR!", MB_OK);
        return 0;
    }
    
    hWnd = CreateWindow(szClassName, "Игра", WS_OVERLAPPEDWINDOW,// | WS_VSCROLL | WS_HSCROLL, 
        500, 200, 600, 500, NULL, NULL, hInstance, NULL); //500 от левого края 200 от верха 600 ширина 500 высота 
    if (!hWnd) {
        MessageBox(NULL, "Can't create window!", "ERROR!", MB_OK);
        return 0;
    }
    
    
    /* показать окно */
    ShowWindow(hWnd, nCmdShow);
    UpdateWindow(hWnd);
    
    /* Обработка сообщений */
    while (GetMessage(&Msg, NULL, 0, 0)) {
 
    TranslateMessage(&Msg);
    DispatchMessage(&Msg);
    }
 
    return Msg.wParam;
}

                             
case WM_PAINT : 
 
HBRUSH Brush;
hdc = BeginPaint (hWnd, &PaintStruct);
 
Brush = CreateSolidBrush(RGB(25,25,25));
SetRect(&r, 500, 0, 600, 500);
FillRect(hdc, &rc, Brush);
DeleteObject(Brush);
 
Brush = CreateSolidBrush(RGB(0,0,0));   
SetRect(&rc, 0, 0, 500, 500);
FillRect(hdc, &r, Brush);
DeleteObject(Brush);
 
sprintf_s(temp, "%d",ntime);
strcat(buffer,temp);
TextOut(hdc, 20, 270, buffer, 25);
EndPaint(hWnd,&PaintStruct);    
break;
 
case WM_DESTROY :