![]() 0 – The amount of time the Timer should wait before its first call to the callback method.null – An object to pass into the callback method.this.Tick – The callback method that the Timer should invoke.The form’s Load event handler creates the Timer object. It then creates a DateTime to hold the event date. This code declares two variables at the class level. Make the timer start now and tick every 500 ms. Private void Form1_Load(object sender, EventArgs e) Private DateTime EventDate = new DateTime(2017, 4, 1) ![]() Initialize information about the event. The following code executes when the program starts. Instead it must call some control’s Invoke method to execute some other method on the UI thread. Unfortunately this kind of timer’s periodic event does not occur in the UI thread so its code cannot directly update the form’s labels. The basic idea is similar: use the timer to periodically see how long it is until the deadline and then display the time remaining. This example does something similar but it uses a Timer object from the System.Threading namespace. ![]() ![]() The post Make a countdown timer in C# uses a Timer control to count down the time until some deadline.
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