Win32 API SetTimer in a loop - winapi

Question

is it possible to have a SetTimer() function inside a loop? Inside WM_TIMER I have a KillTimer() function and it prematurelly ends the loop for SetTimer(). Here's a bit of code, which should draw vertical lines every second with a 10 point incrementation in their X coordinate. Once I reach the end of the dialog box, SetTimer() should be called again but this time all new lines need to be 1 point to the right of the previous ones. This loop happens 10 times and it should make the whole width of the dialog box in random colors.
int x5 = 0 ; int y5 = 10; int y6 = 100; //DrawTimer points global variables
int n=0 //counter global variable
INT_PTR CALLBACK DrawTimer(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam)
{
UNREFERENCED_PARAMETER(lParam);
switch (message)
{
case WM_INITDIALOG:
return (INT_PTR)TRUE;
case WM_COMMAND:
if (LOWORD(wParam) == IDOK || LOWORD(wParam) == IDCANCEL)
{
EndDialog(hDlg, LOWORD(wParam));
return (INT_PTR)TRUE;
}
else if (LOWORD(wParam) == ID_START)
{
int i = 0;
while(true)
{
SetTimer(hDlg,1,1000,NULL);
x5 = 0;
i++;
x5+=i;
if(i == 10)
break;
}
}
break;
case WM_TIMER:
switch(wParam)
{
case 1:
PAINTSTRUCT ps;
HDC hdc;
hdc = BeginPaint(hDlg, &ps);
HPEN hPen;
HGDIOBJ hObj;
RECT rcClient;
int diff;
GetClientRect(hDlg, &rcClient);
diff = rcClient.right - rcClient.left;
int r = rand()%255;
int g = rand()%255;
int b = rand()%255;
hdc = GetDC(hDlg);
hPen = CreatePen(NULL,1,RGB(r,g,b));
hObj = SelectObject(hdc,hPen);
MoveToEx(hdc,x5,y5,NULL);
LineTo(hdc,x5,y6);
x5+=10;
n++;
SetDlgItemInt(hDlg,ID_COUNT,n,NULL);
if (x5 > diff)
KillTimer(hDlg,1);
EndPaint(hDlg, &ps);
}
break;
}
return (INT_PTR)FALSE;
}