Attach event to dynamically created button click

Question

I want to attach an event to a button clicked generated at runtime. Till this point I've wrote the code, but can't pass the button's ID to the method. Here is my code

This code does not through any error, another problem is after the click event the controls get washed away. How to prevent this ?

protected void Button1_Click(object sender, EventArgs e)
   {
     int i = int.Parse(TextBox1.Text);
     for (int x = 1; x <= i; x++)
     {
       Button b = new Button();
       b.ID = "btn_" + x.ToString();
       b.Text = "btn_" + x.ToString();
       b.Click += new System.EventHandler(myEventHandler);
       pnlHolder.Controls.Add(b);
     }
   }

 private void myEventHandler(object sender, EventArgs e)
 {
   txtMain.Text = sender.ToString(); // I want to know which button was pressed
 }

John Woo · Accepted Answer · 2012-09-28 02:17:21Z

2

try,

txtMain.Text = (sender as Button).Name;

or

txtMain.Text = (sender as Button).Text;

answered Sep 28, 2012 at 2:17

John Woo

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1 Comment

Sourav Over a year ago

Sender as button Just loved it (: +1

codingbiz · Accepted Answer · 2012-09-28 02:18:23Z

2

Try this

 private void myEventHandler(object sender, EventArgs e)
 {
   Button b = (Button) sender;
   txtMain.Text = b.ID;
   //
   txtMain.Text = b.Text;

   if(b.ID == "button1")
     doThis();
   else if(b.ID == "button2")
     doThat();
 }

answered Sep 28, 2012 at 2:18

codingbiz

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2 Comments

Sourav Over a year ago

Thanks, +1, btw can you help me with the another problem ? [controls removed after postback]

codingbiz Over a year ago

Asp.net is not like window forms. Controls state are lost at postback. That's why ASP.Net uses ViewState to remember controls you add through design or markup. You'll need to make your buttons as part of ViewState or recreate them everytime the page refreshes

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