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Hii i'm beginner
 

protected void Button_Click(object sender, EventArgs e)
{
Button btn = (Button)sender;
btn.Text = (Int32.Parse(btn.Text) + 1).ToString();
}
Posted 13-Nov-12 21:37pm

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Solution 1

sender refers to the object that invoked the event that fired the event handler. This is useful if you have many objects using the same event handler.
 

Here the "Button_Click" function should be called on the click of a button , hence you are tracking the button click event.
 
//Button btn = (Button)sender;
 
as sender is the button , you are creating a object of the same button class and typecasting the button object and assigning to a local object, then accessing it's properties.
 

This is useful if you have many objects using the same event handler.
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