C#

private void OnPingSuccess()
{
    ...
}

private void OnPingFailure()
{
    ...
}

private async Task MonitorServer(IPAddress address, TimeSpan frequency, CancellationToken cancellationToken)
{
    Ping ping = new Ping();
    while (!cancellationToken.IsCancellationRequested)
    {
        PingResult result = await ping.SendPingAsync(address);
        
        if (pingresult.Status == IPStatus.Success)
        {
            OnPingSuccess();
        }
        else
        {
            OnPingFailure();
        }
        
        await Task.Delay(frequency, cancellationToken);
    }
}

private CancellationTokenSource _cancellationTokenSource;

protected override void OnLoad(EventArgs e)
{
    base.OnLoad(e);
    _cancellationTokenSource = new CancellationTokenSource();
    _ = MonitorServer(IPAddress.Parse("10.10.9.15"), TimeSpan.FromMinutes(1), _cancellationTokenSource.Token);
}

protected override void OnClosed(EventArgs e)
{
    base.OnClosed();
    _cancellationTokenSource?.Cancel();
}

if (dt != null)
{
    DataTable dtbl = dView != null ? dView.ToTable() : dt.Clone();
    dtbl.WriteXml(...);
}

using System.Diagnostics;
using System.IO;
...
string toolsFolder=@"...";
...
private Bitmap getPngImageFromPDF(int resolution, int pageNumber, string pageName, string inName) {
	string args=" -dSAFER -dBATCH -dNOPAUSE -sDEVICE=png16m -dTextAlphaBits=4 "+
	    "-r" + resolution + " -sPageList=" + pageNumber + " -sOutputFile=" + pageName + " " + inName;
	string cmd=Path.Combine(toolsFolder, "gswin32c.exe");
	ProcessStartInfo psi=new ProcessStartInfo(cmd, args);
	psi.CreateNoWindow=true;
	if (!withDebug) psi.WindowStyle=System.Diagnostics.ProcessWindowStyle.Hidden;
	Process proc=Process.Start(psi);
	proc.WaitForExit();
	Bitmap bm=(Bitmap)Image.FromFile(pageName);
	return bm;
}