C#

private delegate void EnableTimerDelegate();
private void EnableTimer()
{
	if(InvokeRequired)
	{
		Invoke(new EnableTimerDelegate(EnableTimer), new object[] {});
		return;
	}
	if(!stepTimer.Enabled)
	{
		stepTimer.Enabled = true;
	}
}

alashara wrote:

Thank you very much it works.

[System.Runtime.InteropServices.StructLayoutAttribute(System.Runtime.InteropServices.LayoutKind.Sequential)]
    public struct SystemTime
{
    public short sYear;
    public short sMonth;
    public short sDayOfWeek;
    public short sDay;
    public short sHour;
    public short sMinute;
    public short sSecond;
    public short sMilliSeconds;
}

[System.Runtime.InteropServices.DllImport("kernel32.dll")]
public static extern bool SetLocalTime(ref SystemTime time);

[System.Runtime.InteropServices.DllImport("kernel32.dll")]
public static extern bool GetLocalTime(ref SystemTime time);

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
    public struct TimeZoneInformation
{
    public int bias;

    [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 32)]
    public string standardName;

    SystemTime standardDate;

    public int standardBias;

    [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 32)]
    public string daylightName;

    SystemTime daylightDate;

    public int daylightBias;
}

[DllImport("kernel32.dll", CharSet = CharSet.Auto)]
private static extern bool SetTimeZoneInformation([In] ref TimeZoneInformation lpTimeZoneInformation);

[DllImport("kernel32.dll", CharSet = CharSet.Auto)]
private static extern int GetTimeZoneInformation(out TimeZoneInformation lpTimeZoneInformation);

ruanr wrote:

Wouldn't it be an intersection of the two? i.e. a class has to be in the same assembly AND and derived rather than OR?

string[] availablePorts = SerialPort.GetPortNames();