OK, I don't really understand your code, in fact you have to find the exact window to send the F5
keypress to it so that it will refresh the desktop. Here is the c# code (tested and worked like a charm:)
[DllImport("user32")]
private static extern int PostMessage(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam);
[DllImport("user32")]
private static extern IntPtr FindWindow(string className, string caption);
[DllImport("user32")]
private static extern IntPtr FindWindowEx(IntPtr parent, IntPtr startChild, string className, string caption);
public void RefreshDesktop(){
IntPtr d = FindWindow("Progman", "Program Manager");
d = FindWindowEx(d, IntPtr.Zero, "SHELLDLL_DefView", null);
d = FindWindowEx(d, IntPtr.Zero, "SysListView32", null);
PostMessage(d, 0x100, new IntPtr(0x74), IntPtr.Zero);//WM_KEYDOWN = 0x100 VK_F5 = 0x74
PostMessage(d, 0x101, new IntPtr(0x74), new IntPtr(1 << 31));//WM_KEYUP = 0x101
}
However I think there are still other choices for you to refresh the desktop programmatically, here is one of the links How to refresh the windows desktop programmatically (i.e. F5) from C#?