how to set a limited time to my console application - c#-3.0

Question

I was thinking how to set a limited period on my console application.
For instance, I want to give just 10 seconds to users to choose or do something when they just come in.
If time exceeds 10 seconds, then the user should get a warning.
Here is my code. I tried to first convert it to string and then to int, but something is wrong...
using System;
using System.Threading;
namespace exercise
{
class Program
static void Main(string[] args)
{
Timer t = new Timer(TimerCallback, null, 0, 2000);
// Wait for the user to hit <Enter>
Console.ReadLine();
}
private static void TimerCallback(Object o)
{
bool loop = true; // Console.WriteLine("{0:h:mm:ss.fff}.\n", DateTime.Now); ----> Creating timer
string b = DateTime.Now.ToString();
// Display the date/time when this method got called.
Console.WriteLine("In TimerCallback: " + b);
int c = Convert.ToInt32(b);
// Force a garbage collection to occur for this demo.
if (c == 10000)
{
Console.WriteLine(" your time is runnig out , hurry up brow");
}
GC.Collect();
}
}

Answer 1

You can use DateTime.ParseExact("2009-05-08 14:40:52,531", "yyyy-MM-dd HH:mm:ss,fff"
to pass a string to datetime, but you will parse the datetime, not the amounts of time passed.
You can store the number of calls in a static field and check the 10 seconds that way.
class Program
{
private static int timerCounter = 1;
static void Main(string[] args)
{
Timer t = new Timer(TimerCallback, null, 0, 2000);
// Wait for the user to hit <Enter>
Console.ReadLine();
}
private static void TimerCallback(Object o)
{
bool loop = true; // Console.WriteLine("{0:h:mm:ss.fff}.\n", DateTime.Now); ----> Creating timer
string b = DateTime.Now.ToString();
// Display the date/time when this method got called.
Console.WriteLine("In TimerCallback: " + b);
// timer callback is every 2 seconds, so every 5th call is 10 sec
if (timerCounter % 5 == 0)
{
timerCounter = 1;
Console.WriteLine(" your time is runnig out , hurry up brow");
}
timerCounter++;
GC.Collect();
}
}