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How to reset a timer in C# winforms

I am working on a windows application where I start a timer .Everything is working but my reset of timer is working for me . It giving me error and timer does not reset
Coding is
t = new System.Timers.Timer();
t.Interval = 1000;
t.Elapsed += OnTimeEvent;
t.Start();
Reset Button Code
private void btnrest_Click(object sender, EventArgs e)
{
t.Dispose();
t = new System.Timers.Timer();
lbltime.Text = "00.00.00";
}
But it is not working
any help

You could use something like this :
private void btnrest_Click(object sender, EventArgs e)
{
t.Stop();
t.Start();
}

Under reset click
t.Enabled = false;
t = new System.Timers.Timer();
t.Interval = 1000;
t.Elapsed += OnTimeEvent;
t.Start(); // by default on start Enabled = true

changing text of button with timeout in c#

How can I change the text of button with timeout? I tried out with the following code but it is not working.
private void button1_Click(object sender, EventArgs e)
{
Stopwatch sw = new Stopwatch();
sw.Start();
if (button1.Text == "Start")
{
//do something
button1.Text = "stop"
if (sw.ElapsedMilliseconds > 5000)
{
button1.Text = "Start";
}
}
How can I correct my code?

You need to use Timer instead:
Timer t = new Timer(5000); // Set up the timer to trigger on 5 seconds
t.SynchronizingObject = this; // Set the timer event to run on the same thread as the current class, i.e. the UI
t.AutoReset = false; // Only execute the event once
t.Elapsed += new ElapsedEventHandler(t_Elapsed); // Add an event handler to the timer
t.Enabled = true; // Starts the timer
// Once 5 seconds has elapsed, your method will be called
void t_Elapsed(object sender, ElapsedEventArgs e)
{
// The Timer class automatically runs this on the UI thread
button1.Text = "Start";
}
Stopwatch is only for measuring how much time has passed since you called Start().

If you're using C# 5
private async void button1_Click(object sender, EventArgs e)
{
button1.Text = "Stop";
await Task.Delay(5000);
button1.Text = "Start";
}

You could use a timer. In this example the text of the button changes to "Stop" after 5 seconds.
private Timer timer = new Timer();
private void button1_Click(object sender, EventArgs e)
{
timer.Interval = 5000; // interval length
timer.Tick += TimerOnTick;
timer.Enabled = true; // activate timer
button1.Text = "Start";
}
private void TimerOnTick(object sender, EventArgs eventArgs)
{
timer.Enabled = false; // deactivate timer
button1.Text = "Stop";
}

I think you can reach your goal by using Timer
Example of using Timer
public partial class FormWithTimer : Form
{
Timer timer = new Timer();
public FormWithTimer()
{
InitializeComponent();
// Everytime timer ticks, timer_Tick will be called
timer.Tick += new EventHandler(timer_Tick);
timer.Interval = (1000) * (1); // Timer will tick every second
timer.Enabled = true; // Enable the timer
}
// .......
showForm() // declaration
{
timer.start();
// .......
timer.stop();
}
void timer_Tick(object sender, EventArgs e)
{
//hide form...through visibility
}
}

Use this instead of Stopwatch:
private void button1_Click(object sender, EventArgs e)
{
button1.Text = "stop"
aTimer = new System.Timers.Timer(5000);
aTimer.Elapsed += new ElapsedEventHandler(OnTimedEvent);
aTimer.Enabled = true;
}
// Specify what you want to happen when the Elapsed event is raised.
private static void OnTimedEvent(object source, ElapsedEventArgs e)
{
button1.Text = "Start";
var atim = source as Timer;
if (atim != null)
atim.Elapsed -= OnTimedEvent;
}

Timer Interval Calling Long Method

What would happen with the code below if Execute() takes, say, 3000ms to finish, but is being called every 1000ms due to the timer interval?
Timer _timer = new Timer();
private void setupTimer()
{
_timer.Tick += new EventHandler(pollingTimeElapsed);
_timer.Interval = 1000;
_timer.Enabled = true;
_timer.Start();
}
private void pollingTimeElapsed(object sender, EventArgs e)
{
Execute();
}
EDIT: I am using System.Windows.Forms.Timer, since System.Timers.Timer doesn't have .Tick

I'm assuming you are using the System.Timers.Timer class.
Since AutoReset has the default value (which is True), the Elapsed event will be fired for each time 1000ms has elapsed.
If you want to fire the event only one time, set AutoReset to False.
If you do not want to fire the event while your execute-code is running, do the following:
Timer _timer = new Timer();
private void setupTimer() {
_timer.Tick += new EventHandler(pollingTimeElapsed);
_timer.Interval = 1000;
_timer.Enabled = true;
_timer.Start();
}
private void pollingTimeElapsed(object sender, EventArgs e) {
try {
_timer.Stop()
Execute();
} finally {
_timer.Start()
}
}

Timer won't tick

I have a Windows.Forms.Timer in my code, that I am executing 3 times. However, the timer isn't calling the tick function at all.
private int count = 3;
private timer;
void Loopy(int times)
{
count = times;
timer = new Timer();
timer.Interval = 1000;
timer.Tick += new EventHandler(timer_Tick);
timer.Start();
}
void timer_Tick(object sender, EventArgs e)
{
count--;
if (count == 0) timer.Stop();
else
{
// Do something here
}
}
Loopy() is being called from other places in the code.

Try using System.Timers instead of Windows.Forms.Timer
void Loopy(int times)
{
count = times;
timer = new Timer(1000);
timer.Enabled = true;
timer.Elapsed += new ElapsedEventHandler(timer_Elapsed);
timer.Start();
}
void timer_Elapsed(object sender, ElapsedEventArgs e)
{
throw new NotImplementedException();
}

If the method Loopy() is called in a thread that is not the main UI thread, then the timer won't tick.
If you want to call this method from anywhere in the code then you need to check the InvokeRequired property. So your code should look like (assuming that the code is in a form):
private void Loopy(int times)
{
if (this.InvokeRequired)
{
this.Invoke((MethodInvoker)delegate
{
Loopy(times);
});
}
else
{
count = times;
timer = new Timer();
timer.Interval = 1000;
timer.Tick += new EventHandler(timer_Tick);
timer.Start();
}
}

I am not sure what you are doing wrong it looks correct, This code works: See how it compares to yours.
public partial class Form1 : Form
{
private int count = 3;
private Timer timer;
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
Loopy(count);
}
void Loopy(int times)
{
count = times;
timer = new Timer();
timer.Interval = 1000;
timer.Tick += new EventHandler(timer_Tick);
timer.Start();
}
void timer_Tick(object sender, EventArgs e)
{
count--;
if (count == 0) timer.Stop();
else
{
//
}
}
}

Here's an Rx ticker that works:
Observable.Interval(TimeSpan.FromSeconds(1))
.Take(3)
.Subscribe(x=>Console.WriteLine("tick"));
Of course, you can subscribe something more useful in your program.

you may have started the timer from another thread, so try invoking it from the correct thread.
for example, instead of:
timerX.start();
Use:
Invoke((MethodInvoker)delegate { timerX.Start(); });

Check if your timer in properties is enabled.
Mine was false and after setting to true it worked.

If you are using Windows.Forms.Timer then should use something like following.
//Declare Timer
private Timer _timer= new Timer();
void Loopy(int _time)
{
_timer.Interval = _time;
_timer.Enabled = true;
_timer.Tick += new EventHandler(timer_Elapsed);
_timer.Start();
}
void timer_Elapsed(object sender, EventArgs e)
{
//Do your stuffs here
}

If you use some delays smaller than the interval inside the timer, the system.timer will execute other thread and you have to deal with a double thread running at the same time. Apply an InvokeRequired to control the flow.

Changing label text property periodically

I have a label. I need to change the text property every 3 seconds. Please let me know how to do this. I tried using timer, but my application is going into infinite loop. I do not want this to happen/ Any help will be appreciated!
timer1.Interval = 5000;
timer1.Enabled = true;
timer1.Tick += new System.EventHandler (OnTimerEvent);
private void OnTimedEvent(object source, ElapsedEventArgs e)
{
refreshStatusBar();
}

In your class constructor, you need to initialize the initial text for the Label and the .NET Framework's Timer component.
timer.Tick += new EventHandler(timer_Tick);
timer.Interval = (1000) * (3); // Timer will tick every 3 seconds
timer.Enabled = true;
timer.Start();
label.Text = DateTime.Now.ToString(); // initial label text.
Then in the timer's tick handler, update the Label's text property.
private void timer_Tick(object sender, ElapsedEventArgs e)
{
label.Text = DateTime.Now.ToString(); // update text ...
}

You should use thread, and when you want to stop call yourthread.Abort();
Update: SynchronizationContext method:
System.Threading.SynchronizationContext sync;
private void Form1_Load(object sender, System.EventArgs e)
{
sync = SynchronizationContext.Current;
System.Windows.Forms.Timer tm = new System.Windows.Forms.Timer { Interval = 1000 };
tm.Tick += tm_Tick;
tm.Start();
}
//Handles tm.Tick
private void tm_Tick(object sender, System.EventArgs e)
{
sync.Post(dopost, DateAndTime.Now.ToString());
}
public void dopost(string txt)
{
Label1.Text = txt;
}