Перестаёт перерисовываться содержимое окна

case WM_PAINT: {    
    hDC = GetDC(hWnd);
    GetClientRect (hWnd, &Rect);
    hDC=BeginPaint(hWnd, &PaintStruct); 
    hCompatibleDC = CreateCompatibleDC(hDC);
    GetClientRect (hWnd, &Rect);
    hCompatibleBitmap = CreateCompatibleBitmap(hDC, Rect.right, Rect.bottom);
    hOldBitmap = (HBITMAP)SelectObject(hCompatibleDC, hCompatibleBitmap);
    PatBlt(hCompatibleDC, 0, 0, Rect.right, Rect.bottom, PATCOPY);
 
    COLORREF color = RGB(100, 100, 100);
    COLORREF color2 = RGB(200, 50, 50);
    POINT pt; 
    HBRUSH Brush;
 
    Rectangle(hCompatibleDC, 0, 0, 700, 800);
 
    HPEN Pen;
    HGDIOBJ obj;
    Pen = CreatePen (PS_SOLID, 3, color);
    obj = SelectObject (hCompatibleDC, Pen);
 
    for (int i = 0; i < tc; i++) {
        MoveToEx (hCompatibleDC, Edge[i].a->x, Edge[i].a->y, &pt);
        LineTo (hCompatibleDC, Edge[i].b->x, Edge[i].b->y);
    }
 
    Brush = CreateSolidBrush(RGB(200, 50, 50));
    obj = SelectObject (hCompatibleDC, Brush);
 
    for (int i = 0; i < doc_count; i++) {
          Ellipse(hCompatibleDC, Node[i].x-10, Node[i].y-10, Node[i].x+10, Node[i].y+10);
          TextOut(hCompatibleDC, Node[i].x+15, Node[i].y-15, Node[i].doc_name, strlen(Node[i].doc_name));       
    }
 
    BitBlt (hDC, 0, 0, PaintStruct.rcPaint.right, PaintStruct.rcPaint.bottom, hCompatibleDC, 0, 0, SRCCOPY);
     DeleteObject(Pen);
     DeleteObject(Brush);
    SelectObject (hCompatibleDC, hOldBitmap);
    DeleteObject(hCompatibleBitmap);
    DeleteDC (hCompatibleDC); 
    EndPaint(hWnd, &PaintStruct); 
    InvalidateRect (hWnd, NULL, false);
}; break;

hDC = GetDC(hWnd);

hDC=BeginPaint(hWnd, &PaintStruct);