Check whether the system is 32 bit or 64 bit

public Boolean Is64Bit_1()
{
	return System.Environment.GetEnvironmentVariable("ProgramW6432") != "";
}

[System.Runtime.InteropServices.DllImport("kernel32.dll", SetLastError = true, 
	CallingConvention = System.Runtime.InteropServices.CallingConvention.Winapi)] 
[return: System.Runtime.InteropServices.MarshalAs(System.Runtime.InteropServices.UnmanagedType.Bool)] 
public static extern bool IsWow64Process([System.Runtime.InteropServices.In] IntPtr hProcess, 
	[System.Runtime.InteropServices.Out] out Boolean lpSystemInfo);
 
public Boolean Is64Bit_2() 
{
	Boolean ret = false;
	IsWow64Process(System.Diagnostics.Process.GetCurrentProcess().Handle, out ret);
	return ret;
}