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using System;
 
public class Test
{
	Button[] buttons= new [] { btnA, btnB, btnC, btnD };
	int seq=0;
	Timer timer;
	public static void Main()
	{
	timer = new Timer();
	timer.Tick +=(s,e)=>
	{
	  seq%= 4;
	  buttons[seq++].Click();	
	};
	timer.Interval = 5000;
	timer.Start(); 
 
	}
 
 
	void Cancel_Click(object sender, EventArgs e)
	{
	    timer?.Stop();
	}
 
}

prog.cs(5,2): error CS0246: The type or namespace name `Button' could not be found. Are you missing an assembly reference?
prog.cs(7,2): error CS0246: The type or namespace name `Timer' could not be found. Are you missing `System.Threading' or `System.Timers' using directive?
Compilation failed: 2 error(s), 0 warnings

Standard output is empty