button control

[juli]

Hello dear ppl!
Do someone know how can I invoke the on_click function of a button
only once?
I want some activity to happen only while I am pressing the button the
first time and not to happen on the other times.
Is it possible? If so,how?
Thanks a lot and Happy New Year!

[Shiva]

Just disable the button after you are done with it so that it can't be
clicked again.

"juli" <ji****@gmail.com> wrote in message
news:1f**************************@posting.google.c om...
Hello dear ppl!
Do someone know how can I invoke the on_click function of a button
only once?
I want some activity to happen only while I am pressing the button the
first time and not to happen on the other times.
Is it possible? If so,how?
Thanks a lot and Happy New Year!

[Peter Jausovec]

Hi,

Add a global bool variable and set it to false when the on_click is called
the first time. e.g.:

public void onClick ()
{
if (bFirstTime)
{ // this happens only once
bFirstTime = false;
}
// this happens very time
}

--
Regards,
Peter Jausovec
(http://blog.jausovec.net)
"juli" <ji****@gmail.com> je napisal v sporocilo
news:1f**************************@posting.google.c om ...

Hello dear ppl!
Do someone know how can I invoke the on_click function of a button
only once?
I want some activity to happen only while I am pressing the button the
first time and not to happen on the other times.
Is it possible? If so,how?
Thanks a lot and Happy New Year!

[Amrro]

I will add a public variable and will change its values in the END of first
click, and validate next time.

Amrro

"juli" <ji****@gmail.com> wrote in message
news:1f**************************@posting.google.c om...

Hello dear ppl!
Do someone know how can I invoke the on_click function of a button
only once?
I want some activity to happen only while I am pressing the button the
first time and not to happen on the other times.
Is it possible? If so,how?
Thanks a lot and Happy New Year!

[Ignacio Machin \( .NET/ C# MVP \)]

Hi,

There is several ways of doing it:

1- Button.Enabled = false
2- keeping a flag ( bool variable ) :
bool used= false;
void onclick(.... )
{
if ( used ) return;
used = true;
3- Unhook the event handler:
Form1_OnLoad( .... )
{
EventHandler ev = new EventHandler( onClick );
button1.Click += ev;
}
void onClick(... )
{
buttton1.Click -= ev;
}

4- Hide the button :
button1.Visible = false;
I would use number 1 , in this case the user see that the button is disabled
and is aware that clicking on it will have no effect.

Cheers,

--
Ignacio Machin,
ignacio.machin AT dot.state.fl.us
Florida Department Of Transportation

"juli" <ji****@gmail.com> wrote in message
news:1f**************************@posting.google.c om...

Hello dear ppl!
Do someone know how can I invoke the on_click function of a button
only once?
I want some activity to happen only while I am pressing the button the
first time and not to happen on the other times.
Is it possible? If so,how?
Thanks a lot and Happy New Year!

[Cor Ligthert]

Juli,

I thought I had sent a message however I do not see it.

I would hidden the button however I tried this what is a direct answer on
your question and I thought that this did work as well.
\\\
private void button1_Click(object sender, System.EventArgs e)
{
//whatever code
this.button1.Click -= new System.EventHandler(this.button1_Click);
}
///
I hope this helps,

Cor