Refresh the output

  • Thread starter Thread starter Lam
  • Start date Start date
L

Lam

Hi
I try to write a C# windows program which will read some data from database
and display on the screen. It has to refresh the output every 10 seconds
because
the database keep growing every seconds.
so how can I do the refresh?

Thanks
 
Hi Lam,
depends on what kind of control you are trying to update. You can use a
System.Window.Forms.Timer to cause an event to fire every few seconds which
calls a method, inside the method you can fetch your new values and update
your control i.e.

//event that handles a start button being clicked - you don't need this but
I just put it hear for clarity in the example.

System.Windows,Forms.Timer m_objTimer = null;

public void btnStart(Object sender, EventArgs e)
{
//if it is already running need to stop existing timer
if(m_objTimer != null)
{
m_objTimer.Stop();
}
else
{
m_objTimer = new System.Windows.Forms.Timer();
}

//set the number of milliseconds between each timer event ie 10sec
m_objTimer.Interval = 10000;

//add the handler function that will handle to timer tick event
m_objTimer.Tick += new EventHandler(m_objTimer_Tick);
}


public void btnStop(Object sender, EventArgs e)
{
//if it is already running need to stop existing timer
if(m_objTimer != null)
{
m_objTimer.Stop();
}
}


//this function is called every time the timer raises a tick event
private void m_objTimer_Tick(object sender, EventArgs e)
{
//fetch data from database

//update controls with new data
this.labelCurrentValue.Text = strDatabaseText
}


Hope that helps
Mark.
 
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