String.IsNullOrEmpty - C# Discussion Boards

Re: Method to set time

Vikram A Punathambekar6-Sep-07 0:14

Vikram A Punathambekar

6-Sep-07 0:14

You will need a Timer control for this. There are lots of examples on Google.

Cheers,
विक्रम

Be yourself, no matter what they say.
- Sting, Englishman in New York.

Re: Method to set time

iet20006-Sep-07 1:19

iet2000

6-Sep-07 1:19

It worked.
Thanks and Regards,

Priya

Compare Word docs

Nitin.raj5-Sep-07 23:53

Nitin.raj

5-Sep-07 23:53

i have to compare a word document which has been edited with the original ie., document before editing. how do i do this in c#.

Nitin Raj Bidkikar

Re: Compare Word docs

originSH6-Sep-07 0:05

originSH

6-Sep-07 0:05

You haven't specified the version on word so I'm going to assume you don't mean 2007.

Older versions of word use Structured Storage aka DocFile.

These files are accessed via the windows api ... heres an article covering that api:

http://www.codeproject.com/file/structstor.asp[^]

There are lots of hits on google for using Strucutred Storage[^] and DocFile[^] from C#.

crystal report export problem

sakthi dasan5-Sep-07 23:38

sakthi dasan

5-Sep-07 23:38

Hi All

I am using crystal Report in C# 2005 asp.net
I want to export the crystal report to image (like Jpeg,Gif)
Any one please help me

it is very urgent Rose | [Rose]

Sakti

Licencing Problem urgent

Nishad855-Sep-07 23:34

Nishad85

5-Sep-07 23:34

I have an application in C# which should be installed on 10 machines.. I would like a way to make sure that they do not install on more than that. I would like to give them a way to activate each terminal. Since all terminals will be sharing a DataBase ,maybe we can have a verification process that asks them to input an activation code.Can any one help me regarding this?

Re: Licencing Problem urgent

MicealG6-Sep-07 1:27

MicealG

6-Sep-07 1:27

If you don't mind spending the money you can use www.copyminder.com but if I were you I would request the names of the 10 computers and their IP Addresses that the application will be running on this way you can check if a computer is one of these 10 and if so allow the application to run otherwise not.

I know it's messy and probably not the best idea, but it will work.

Freedom is the right to say that 2+2=5 if this is so everything else will follow.

String.IsNullOrEmpty

nasambur5-Sep-07 23:31

nasambur

5-Sep-07 23:31

Hi,
Which one gives better performance, checking a string against null & empty.

string s = "something";

for(int i=0; i<100; i++) {
  if(s != null) {
    if(s.Length > 0) {
      // do something
    }
  }
}

for(int i=0; i<100; i++) {
  if(!String.IsNullOrEmpty(s)) {
    // do something
  }
}

plz help,
nas

Re: String.IsNullOrEmpty

originSH5-Sep-07 23:49

originSH

5-Sep-07 23:49

put it in a loop that will run a few hundred thousand times and use the System.Diagnostics.StopWatch[^].

It's a good idea to get used to testing things like this yourself ... it's quicker than asking on here, more reliable and you have more chance of getting an answer with some of the more obscure stuff (not that IsNullOrEmpty is obsucre).

Re: String.IsNullOrEmpty

ed^nrgc7-Sep-07 4:26

ed^nrgc

7-Sep-07 4:26

But he doesn't want to do any of the work himself. He needs someone to do his homework form him.

Re: String.IsNullOrEmpty

Urs Enzler6-Sep-07 1:02

Urs Enzler

6-Sep-07 1:02

Or use Reflector to check what String.isNullOrEmpty does:

public static bool IsNullOrEmpty(string value)
{
    if (value != null)
    {
        return (value.Length == 0);
    }
    return true;
}

IsNullOrEmpty is therefore just a bit slower because there is a strack frame more present (for calling the method). But compared to the time you are using in writing that every time, I'd use IsNullOrEmpty Wink | ;)

-^-^-^-^-^-
no risk no funk ................... please vote ------>

Re: String.IsNullOrEmpty

Colin Angus Mackay6-Sep-07 1:13

Colin Angus Mackay

6-Sep-07 1:13

Seriously, for the additional fractions of a microsecond that IsNullOrEmpty takes I wouldn't worry about it.

Upcoming FREE developer events:
* Glasgow: Agile in the Enterprise Vs. ISVs, db4o: An Embeddable Database Engine for Object-Oriented Environments, Mock Objects, SQL Server CLR Integration, Reporting Services ...

My website

Re: String.IsNullOrEmpty

PIEBALDconsult6-Sep-07 4:47

PIEBALDconsult

6-Sep-07 4:47

Won't .Length check for null again anyway? If so, you're checking for null twice.

I'd just use IsNullOrEmpty figuring Microsoft wouldn't steer me wrong. Big Grin | :-D

Re: String.IsNullOrEmpty

Colin Angus Mackay6-Sep-07 6:00

Colin Angus Mackay

6-Sep-07 6:00

PIEBALDconsult wrote:
Won't .Length check for null again anyway? If so, you're checking for null twice.

.Length cannot operate on null so it will throw an exception.

Re: String.IsNullOrEmpty

PIEBALDconsult6-Sep-07 6:24

PIEBALDconsult

6-Sep-07 6:24

::Smacking forehead with heel of hand::

sealed classes

Sonia Gupta5-Sep-07 23:29

Sonia Gupta

5-Sep-07 23:29

i know the meaning of sealed classes.My Question is when should i use the sealed classes.

Sonia Gupta
Soniagupta1@yahoo.co.in
Yahoo messengerId-soniagupta1
Love is Friendship and Friendship is Love....

Re: sealed classes

originSH5-Sep-07 23:46

originSH

5-Sep-07 23:46

Well the meaning of it shows when it should be used ... it stops anyone inheriting your class, so it should be used when you don't want someone to inherit your class :P

Two examples of this in the Base Class Libraries are the List and String Builder. These 2 are sealed as they are "high performance" classes which microsoft don't want anyone inheriting and then messing around with the internals and messing them up (well thats the official line anyway).

Re: sealed classes

Sonia Gupta6-Sep-07 0:52

Sonia Gupta

6-Sep-07 0:52

I KNOW IT SHOULD BE USED TO DEPRIVE OF SOME INHERITING MY CLASSES.
BUT ONE CAN ACCESS THE MEMBER FUNCTIONS AND MEMBER VARIABLES BY INSTANTIATING THE CLASS.

Sonia Gupta
Soniagupta1@yahoo.co.in
Yahoo messengerId-soniagupta1
Love is Friendship and Friendship is Love....

Re: sealed classes

Urs Enzler6-Sep-07 1:05

Urs Enzler

6-Sep-07 1:05

Sure, you can access the members of a sealed class. sealed is not an access modifier like private, protected, public, internal, protected internal.

-^-^-^-^-^-
no risk no funk ................... please vote ------>

Re: sealed classes

Pete O'Hanlon6-Sep-07 1:35

Pete O'Hanlon

6-Sep-07 1:35

Please - no shouting. Your keyboard has both upper and lower case.

Deja View - the feeling that you've seen this post before.

Re: sealed classes

Pete O'Hanlon6-Sep-07 1:49

Pete O'Hanlon

6-Sep-07 1:49

Yes. And your point was?

Sealed doesn't mean it can't be instantiated - that's what abstract means. It just means that it can't be inherited.

Deja View - the feeling that you've seen this post before.

Re: sealed classes

PIEBALDconsult6-Sep-07 4:49

PIEBALDconsult

6-Sep-07 4:49

Hardly ever; it's rude. I very much dislike running up against sealed classes and having to find a less-elegant solution than inheritance.

Re: sealed classes

Scott Dorman6-Sep-07 18:09

Scott Dorman

6-Sep-07 18:09

PIEBALDconsult wrote:
I very much dislike running up against sealed classes and having to find a less-elegant solution than inheritance.

I agree on this point, but there are also cases where sealed classes are useful. The most common use are for performance sensitive classes, utility helper classes (which can now use the static keyword, which also makes them sealed), and value types (all enums are sealed).

With the upcoming .NET 3.5 release, not being able to inherit a sealed class becomes less of an issue due to extension methods.

Scott.

—In just two days, tomorrow will be yesterday.

[Forum Guidelines] [Articles] [Blog]

Insert character

M Riaz Bashir5-Sep-07 23:14

M Riaz Bashir

5-Sep-07 23:14

Hi,

Kindly help me that, How can I insert a character between any string value?
Example: string value is : ABC/DEF/GHI
after inserting..........: ABC-DEF-GHI

Thank you in advance

Re: Insert character

blackjack21505-Sep-07 23:22

blackjack2150

5-Sep-07 23:22

Use the Insert method of the string class.
However, in your example you replaced a character with another one. In this case use the Replace method.

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.