SO simple..but?

[den.NET]

assume i have 2 text boxes in the visual studio windows form c++.NET
2003.and there is a button adding the values entered the
textboxes.but i forget to fill one and push the button.it gives me an
error.how can i get rid of this?how can i define the code in the
button that the textbox is null(or empty)?as i said,it is so simple
and i am also a newbie;).thank u anyone who cares.

*-----------------------*
Posted at:

https://www.GroupSrv.com

*-----------------------*

[Peter Jausovec]

Re: SO simple..but?

Hi,

Just check if your textbox is empty. (if (textBox.Text == ""))

--
Regards,
Peter Jausovec
(http://blog.jausovec.net)
"den.NET" <dentaro@wall a-dot-com.no-spam.invalid> je napisal v sporocilo
news:41b85943$1 _4@Usenet.com ...[color=blue]
> assume i have 2 text boxes in the visual studio windows form c++.NET
> 2003.and there is a button adding the values entered the
> textboxes.but i forget to fill one and push the button.it gives me an
> error.how can i get rid of this?how can i define the code in the
> button that the textbox is null(or empty)?as i said,it is so simple
> and i am also a newbie;).thank u anyone who cares.
>
> *-----------------------*
> Posted at:
> www.GroupSrv.com
> *-----------------------*[/color]

[Peter van der Goes]

Re: SO simple..but?


"den.NET" <dentaro@wall a-dot-com.no-spam.invalid> wrote in message
news:41b85943$1 _4@Usenet.com.. .[color=blue]
> assume i have 2 text boxes in the visual studio windows form c++.NET
> 2003.and there is a button adding the values entered the
> textboxes.but i forget to fill one and push the button.it gives me an
> error.how can i get rid of this?how can i define the code in the
> button that the textbox is null(or empty)?as i said,it is so simple
> and i am also a newbie;).thank u anyone who cares.
>
> *-----------------------*
> Posted at:
> www.GroupSrv.com
> *-----------------------*[/color]

Here's a way to trap any input error, not just lack of input. Assuming
textBox1 and textBox2 are for input to the addition problem:

private: System::Void button1_Click(S ystem::Object * sender,
System::EventAr gs * e)

{

double d1, d2, d3;

try

{

d1 = Convert::ToDoub le(textBox1->Text);

d2 = Convert::ToDoub le(textBox2->Text);

}

catch (Exception* e)

{

d1 = 0;

d2 = 0;

MessageBox::Sho w(e->Message);

textBox1->Clear();

textBox2->Clear();

textBox1->Focus();

}

d3 = d1 + d2;

textBox3->Text = Convert::ToStri ng(d3);


}

Obviously, this can be greatly improved, but I hope it gives you the idea.


--
Peter [MVP Visual Developer]
Jack of all trades, master of none.

[Ben Solomon]

RE: SO simple..but?

Something like this:

if ( (textBox1->Text)->CompareTo("" ) == 0 )
{
textBox1->Text = "Text box one empty";
}


"den.NET" wrote:
[color=blue]
> assume i have 2 text boxes in the visual studio windows form c++.NET
> 2003.and there is a button adding the values entered the
> textboxes.but i forget to fill one and push the button.it gives me an
> error.how can i get rid of this?how can i define the code in the
> button that the textbox is null(or empty)?as i said,it is so simple
> and i am also a newbie;).thank u anyone who cares.
>
> *-----------------------*
> Posted at:
> www.GroupSrv.com
> *-----------------------*
>[/color]