The && logical operator is not working or is it me?

Posted on 2015-02-09
Last Modified: 2015-02-09
Hi, I'm using vs2012
Please see attached code.

This value,  gridEditUser.Enabled.Value, is false.  I double check it in the debug mode.  The rest of the || condition would evaluate to be true.  Problem that is blows my mind that it apparently evaluate to be true and went on to process the rest of the code.
Question by:lapucca
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
LVL 34

Expert Comment

by:Mike Eghtebas
ID: 40599231
I am looking at it closely. But AND in English writing translates to OR in programming.

It is like executing items to by per this select statement:

Select Fruit From Produce
Where Fruit = 'Apple' OR  Fruit = 'Orange'

This person was told Apple and Orange. So he will have Apple and Orange in the list.

The following will have nothing to return:

Select Fruit From Produce
Where Fruit = 'Apple' AND  Fruit = 'Orange'
LVL 70

Accepted Solution

Éric Moreau earned 500 total points
ID: 40599241
try this:

     if( gridEditUser.Enabled.Value && ( (String.IsNullOrEmpty(gridEditUser.Surname)) || (String.IsNullOrEmpty(gridEditUser.GivenName))  || (String.IsNullOrEmpty(gridEditUser.MiddleName)) || (String.IsNullOrEmpty(gridEditUser.VoiceTelephoneNumber)) ) )
                    e.Cancel = true;
                    lblError.Visible = true;
                    lblError.Text = "First Name, Last Name, Middle Name and Cell Phone fields are all reqired.";

Open in new window

LVL 34

Expert Comment

by:Mike Eghtebas
ID: 40599261
Maybe that holds in SQL only, your testing will determine if it is the same in procedural programming.

Typos fixed...

It is like executing items to buy per the list produced by the select statement below:

Select Fruit From Produce
Where Fruit = 'Apple' OR  Fruit = 'Orange'

This person was told to buy Apple AND Orange. So he will have Apple and Orange in the above list to buy

But, the following will have nothing to return, so he will not buy Apple or Orange.

Select Fruit From Produce
Where Fruit = 'Apple' AND  Fruit = 'Orange

Author Closing Comment

ID: 40599280
Thank you.  I thought I was losing my mind.  I was just missing the parenthesis.

Featured Post

Online Training Solution

Drastically shorten your training time with WalkMe's advanced online training solution that Guides your trainees to action. Forget about retraining and skyrocket knowledge retention rates.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Introduction Hi all and welcome to my first article on Experts Exchange. A while ago, someone asked me if i could do some tutorials on object oriented programming. I decided to do them on C#. Now you may ask me, why's that? Well, one of the re…
A quick way to get a menu to work on our website, is using the Menu control and assign it to a web.sitemap using SiteMapDataSource. Example of web.sitemap file: (CODE) Sample code to add to the page menu: (CODE) Running the application, we wi…
Monitoring a network: why having a policy is the best policy? Michael Kulchisky, MCSE, MCSA, MCP, VTSP, VSP, CCSP outlines the enormous benefits of having a policy-based approach when monitoring medium and large networks. Software utilized in this v…
Add bar graphs to Access queries using Unicode block characters. Graphs appear on every record in the color you want. Give life to numbers. Hopes this gives you ideas on visualizing your data in new ways ~ Create a calculated field in a query: …

691 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question