Responding to user input | WM_KEYDOWN | Virtual Key

[dungeon]

Following Window Procedure draws a specific pattern using WM_PAINT message (executes correctly). Now when user hit the UP arrow key, I want this pattern to move from position x=500, y=250 (declared as global variables) to position x=500, y=y+5.

I tried to implement this using WM_KEYDOWN message, but with no luck. Any help would be highly appreciated...

LRESULT CALLBACK MainWindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
    switch(uMsg)
    {
        case WM_CLOSE:
            if(MessageBox(hwnd, "Really quit?", "My application", MB_OKCANCEL)==IDOK)
            DestroyWindow(hwnd);
            break;

        case WM_DESTROY:
            PostQuitMessage(0);
            break;
        case WM_PAINT:
            DrawPixels(hwnd);
            break;
        case WM_KEYDOWN:
            {
                switch(wParam)
                {
                    case VK_UP:
                    y = y + 5;
                    break;
                    default:
                    break;
                }
            }
            break;
        default:
            return DefWindowProc(hwnd, uMsg, wParam, lParam);
    }
    return 0;
}

Code for DrawPixels function is also enclosed for reference purpose:

void DrawPixels(HWND hwnd)
{
     PAINTSTRUCT ps;
     RECT r;
     GetClientRect(hwnd, &r);
     HDC hdc = BeginPaint(hwnd, &ps);
     SetPixel(hdc, -5 + x,      y, RGB(0,0,0));
     SetPixel(hdc, -4 + x,      y, RGB(0,0,0));
     SetPixel(hdc, -3 + x,      y, RGB(0,0,0));
     SetPixel(hdc,  3 + x,      y, RGB(0,0,0));
     SetPixel(hdc,  4 + x,      y, RGB(0,0,0));
     SetPixel(hdc,  5 + x,      y, RGB(0,0,0));
     SetPixel(hdc,      x, -5 + y, RGB(0,0,0));
     SetPixel(hdc,      x, -4 + y, RGB(0,0,0));
     SetPixel(hdc,      x, -3 + y, RGB(0,0,0));
     SetPixel(hdc,      x,  3 + y, RGB(0,0,0));
     SetPixel(hdc,      x,  4 + y, RGB(0,0,0));
     SetPixel(hdc,      x,  5 + y, RGB(0,0,0));
     EndPaint(hwnd, &ps);
}

[Salem]

Well you need to send yourself a redraw message - or something.
WM_SETREDRAW message (Winuser.h) - Win32 apps | Microsoft Docs

[dungeon]

Well you need to send yourself a redraw message - or something.
WM_SETREDRAW message (Winuser.h) - Win32 apps | Microsoft Docs

Thanks for the pointer man... will study this & surely update... but it might take some time (as i am bit slow )