How to get window handle of an excel application

[Gary]

Hi, there,

I need to get the handle of a running excel application. However, there is
no HWnd property. Following is my code:
--------------------------------------------------------------
Process [] Processes = Process.GetProcesses();
for (int i = 0; i <= Processes.GetUpperBound(0); i++)
{
if (Processes[i].MainWindowHandle.ToString() == ExcelApp.Hwnd.ToString())
{
_mExcelPID = aProcesses[i].Id;
break;
}
}
---------------------------------------------------
How to get the exact program ID in this case? Thanks lot in advance!

Gary