What we want to do now is to display a message box whenever the button is clicked.
So we need the coding window. To see the code for the button, double click the
button you added to the Form. When you do, the coding window will open, and
your cursor will be flashing inside of the button code. It will look like this:
The only difference from the last time you saw this screen is the addition
of the code for the button. This code:
private void button1_Click(object sender, EventArgs e)
{
}
This is just another Method, a piece of code that does something. The name
of the Method is button1_Click. It’s called button1 because that’s currently
the Name of the button. When you changed the Text, Location, and Size
properties of the button, you could have also changed the Name property from
button1 (the default Name) to something else.
The _Click part after button1 is called an Event. Other events
are MouseDown, LocationChanged, TextChanged, and lots more. You’ll learn more
about Events later.
After _Click, and in between a pair of round brackets, we have this:
object
sender, EventArgs e
These two are know as arguments. One arguments is called sender,
and the other is called e. Again, you’ll learn more about arguments later,
so don’t worry about them for now.
Notice that there is a pair of curly brackets for the button code:
private void button1_Click(object sender, EventArgs e)
{
}
If you want to write code for a button, it needs to go between the two curly
brackets. We’ll add a single line of code in the next part below.
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Kaynak : https://www.homeandlearn.co.uk/csharp/csharp_s1p8.html ‘sitesinden alıntı