.NET (Core and Framework)

XmlDocument doc = new XmlDocument();<br />
XmlProcessingInstruction pi = doc.CreateProcessingInstruction(...);<br />
doc.AppendChild(pi);

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"When the only tool you have is a hammer, a sore thumb you will have."

EuroCPian Spring 2004 Get Together[^]
"You can have everything in life you want if you will just help enough other people get what they want." --Zig Ziglar

private static void Application_Idle(object sender, EventArgs e)
{
    while(DoIdleTimeProcessing())
    {
        Application.DoEvents();
    }
}

private static bool DoIdleTimeProcessing()
{
    // Performs the processing necessary at idle time.
    return isMoreProcessingToDo;
}

EuroCPian Spring 2004 Get Together[^]
"You can have everything in life you want if you will just help enough other people get what they want." --Zig Ziglar