C#

public static Window[] EnumerateTopWindows()
    {
      ArrayList windowList = new ArrayList();
      IntPtr hWnd = IntPtr.Zero;
      Window window = null;

      // Get first window
      hWnd = GetActiveWindow();
      hWnd = GetWindow(hWnd, GW_HWNDFIRST);

      while (hWnd != IntPtr.Zero)
      {
        if (IsWindow(hWnd) && IsWindowVisible(hWnd))
        {
          IntPtr parentWin = GetParent(hWnd);
          if ((parentWin == IntPtr.Zero))
          {
            string text = GetText(hWnd);
            int length = text.Length;
            if (length > 0)
            {
              if (text != "Tray" && text != "Start" && text != "Task Manager" && text != "Program Manager")
              {
                window = new Window();
                window.Handle = hWnd;
                window.Text = text;
                windowList.Add(window);
              }
            }
          }
        }
        hWnd = GetWindow(hWnd, GW_HWNDNEXT);
      }
      return (Window[])windowList.ToArray(typeof(Window));
    }

private static string GetText(IntPtr hWnd)
    {
      int cap = 1048576;

      StringBuilder buffer = new StringBuilder(cap);
      SendMessage(hWnd.ToInt32(), WM_GETTEXT, cap, buffer);

      return Convert.ToString(buffer);
    }

Old Gun wrote:

I use static private variable and property,I think there is somthing wrong.

Bitmap bmp = new Bitmap();
bmp.SetPixel(0, 0, myColor);

myGraphics.DrawImageUnscaled(bmp, myPoint);

DataGridViewRow rw = new DataGridViewRow();
....
rw.CreateCells(dataGridView1);
rw.SetValues("oo");
dataGridView1.Rows.Add(rw);