how to IF?!

[Jassim Rahma]

I have two textbox BP_S and BP_D how can I make sure if one textbox is not null then the other should not be null as well... && and || won't worked I guess..

[Luc Pattyn]

There is no room for guessing in software development.

bool isBad = text1!="" && text2==""

[CORRECTION: TextBox.Text never is null, it is an empty or a non-empty string] :)

Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles]

---

Getting an article published on CodeProject should be easier and faster for Bronze and Silver authors.

---

modified on Friday, April 9, 2010 6:17 PM

[Lost User]

Why are your textboxes null to begin with? How about if (BP_S != null && BP_D != null)? Or did you mean that it is ok for the second textbox to be null as long as the first textbox is null as well: if (BP_D != null || BP_S == null)? (this is not help, btw, it's a bunch of questions)

[Jassim Rahma]

There is no room for guessing in software development.

I have to mark it.. you are right...

[Jassim Rahma]

no i mean: if the user entered BP_S then he MUST enter BP_D similarly, if the user entered BP_D then he MUST enter BP_S but user can leave both BP_S and BP_D as NULL

[Lost User]

Ok so more like this: if (BP_S.Text.Length == 0 || BP_D.Text.Length != 0)?

[Migounette]

I prefer this for String type: bool isBad = ((String.IsNullOrEmpty(text1) == true) || (String.IsNullOrEmpty(text2))) My 2 cents

[Jassim Rahma]

yes but this code will force the user to enter one of the textbox.. What if the user wants to leave the null?

[Lost User]

Ok it's quite late here and I'm tired so I could be wrong, but I'm fairly certain that if they are both null, that condition will evaluate to true

[Jassim Rahma]

it's ok.. rest now :) I will also sleep and come back later... it's 1:30am here in Bahrain.. Sweet Dreamz :)

[AspDotNetDev]

Wow, this is probably the first time I've seen a valid use for the EXCLUSIVE OR operator:

if (!(string.IsNullOrEmpty(textBox1.Text) ^ string.IsNullOrEmpty(textBox2.Text)))
{
MessageBox.Show("Valid");
}
else
{
MessageBox.Show("Invalid");
}

You could also do that with && and ||, but this is probably the most succint technique.

[Forum Guidelines]

[Lost User]

aspdotnetdev wrote:

but this is probably the most succint technique

Maybe 2 or 3 characters shorter :)

[Luc Pattyn]

most succinct? if exclusive OR is what the OP wants, then there is no need for XOR, OR, AND operators! Mind you, TextBox.Text never returns null.

MessageBox.Show((textBox1.Text.Length==0)==(textBox2.Text.Length==0)?"Valid":"Invalid");

:)

Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles]

---

Getting an article published on CodeProject should be easier and faster for Bronze and Silver authors.

---

[NavnathKale]

:doh:

if((!String.IsNullOrEmpty(BP_S.Text) && !String.IsNullOrEmpty(BP_D.Text)) || (String.IsNullOrEmpty(BP_S.Text) && String.IsNullOrEmpty(BP_D.Text)))

Mark as answer if its really satisfies ur query !!!! :)

modified on Saturday, April 10, 2010 8:52 AM

[Lost User]

Now that's interesting, because that wouldn't allow you to fill in the second textbox if you didn't fill in the first as well - and he never said anything about that. Basically it's the same as aspdotnetdev's, but in the least-succinct way.

[AspDotNetDev]

You fool! It can be MUCH more succint!

MessageBox.Show((textBox1.Text.Length>0)==(textBox2.Text.Length>0)?"Valid":"Invalid");

[Forum Guidelines]

[Luc Pattyn]

Do you mean

MessageBox.Show(((tb1.Text.Length>0)==(tb2.Text.Length>0)?"V":"Inv")+"alid");

? :)

Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles]

---

Getting an article published on CodeProject should be easier and faster for Bronze and Silver authors.

---

[AspDotNetDev]

Haha, I did exactly that, but then found it to take up more characters than the other method, to be less clear, and to potentially take up more processing time (the strig concatenation). If you make both words lowercase, you can get it down to exactly the same number of characters as the one I posted, but it still has the other issues. But nice try. ;)

[Forum Guidelines]

[Luc Pattyn]

correct.

MessageBox.Show((tb1.Text.Length>0)==(tb2.Text.Length>0)?"OK":"!OK");

:)

Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles]

---

Getting an article published on CodeProject should be easier and faster for Bronze and Silver authors.

---

[AspDotNetDev]

I had a nice long reply I was working on, but my Internet decided to go down just as I posted it. So, lucky for you, you get the short version instead:

((a.L>0)==(b.L>0)).S();

;P

[Forum Guidelines]