Execute specified function every X seconds

Question

I have a Windows Forms application written in C   The following function checks whenever printer is online or not   public void isonline         PrinterSettings settings   new PrinterSettings        if  CheckPrinter settings PrinterName      offline                 pictureBox1 Image   pictureBox1 ErrorImage            and updates the image if the printer is offline  Now  how can I execute this function isonline   every 2 seconds so when I unplug the printer  the image displayed on the form  pictureBox1  turns into another one without relaunching the application or doing a manual check   eg  by pressing  Refresh  button which runs the isonline   function

User · Answer

The most beginner-friendly solution is   Drag a Timer from the Toolbox  give it a Name  set your desired Interval  and set  Enabled  to True  Then double-click the Timer and Visual Studio  or whatever you are using  will write the following code for you   private void wait Tick object sender  EventArgs e        refreshText       Add the method you want to call here      No need to worry about pasting it into the wrong code block or something like that

User · Answer

Threaded            lt summary gt          Usage  var timer   SetIntervalThread DoThis  1000           UI Usage  BeginInvoke  Action       gt   SetIntervalThread DoThis  1000                 lt  summary gt           lt returns gt Returns a timer object which can be disposed  lt  returns gt      public static System Threading Timer SetIntervalThread Action Act  int Interval                TimerStateManager state   new TimerStateManager            System Threading Timer tmr   new System Threading Timer new TimerCallback     gt  Act     state  Interval  Interval           state TimerObject   tmr          return tmr          Regular           lt summary gt          Usage  var timer   SetInterval DoThis  1000           UI Usage  BeginInvoke  Action       gt   SetInterval DoThis  1000                 lt  summary gt           lt returns gt Returns a timer object which can be stopped and disposed  lt  returns gt      public static System Timers Timer SetInterval Action Act  int Interval                System Timers Timer tmr   new System Timers Timer            tmr Elapsed     sender  args    gt  Act            tmr AutoReset   true          tmr Interval   Interval          tmr Start             return tmr

User · Answer

Use System Windows Forms Timer   private Timer timer1   public void InitTimer         timer1   new Timer        timer1 Tick    new EventHandler timer1 Tick       timer1 Interval   2000     in miliseconds     timer1 Start       private void timer1 Tick object sender  EventArgs e        isonline        You can call InitTimer   in Form1 Load

User · Answer

You can do this easily by adding a Timer to your form  from the designer  and setting it s Tick-function to run your isonline-function

[c#] Execute specified function every X seconds

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