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This is really a stupid question in this forum, take it to the design and architecture forum where you may get someone to discuss this with you.
Even there you will need to have some ideas of your own and asking for as much info as possible is just plain rude!
Never underestimate the power of human stupidity
RAH
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hi! i want to create a popup window in my desktop application,which appear at program startup on the position above the system clock, please give some general ideas to do so.
thanks 
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Use ShowDialog to display an instance of your popup. What are you having difficulties with?
I know the language. I've read a book. - _Madmatt
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You might also want to look into notifyicon and it's applications.
Never underestimate the power of human stupidity
RAH
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Thanks a lot for your link.
It can be very useful and I'll keep it, but it isn't what I'm looking for.
I'm looking for a code that can integrate with the System Shell:
it should add some menu items to the Shell context menu, while the user is right-clicking on an Explorer icon.
The context menu shouldn't be shown when the user clicks on a button of a windows form.
However, thanks a lot again!
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Do not ask the same question again by referencing another post.
This is a voluntary site, someone can choose to answer your question, or not. If there had been an answer you would have gotten one with your first post. What you have done here is very rude and inconsiderate.
I know the language. I've read a book. - _Madmatt
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hi
a function called Save() saves user input to database
should i write try catch block like this
private void Save()
{
try
{
}
catch (SqlException sqlEx)
{
MessageBox.Show(sqlEx.Message);
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
or should i write it like this in the function or event handler that calls Save();
try
{
Save();
}
catch (SqlException sqlEx)
{
MessageBox.Show(sqlEx.Message);
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
and what is the difference, if there was a difference
and which is a better coding practice
thanks
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It depends on what you're going to do with the exception. If the exception is of no consequence to external code and can be handled within the Save method itself, then keep the try/catch in there.
If the calling code may (now or in the future) want to do something depending on the exception then wrap the Save in the calling code.
The second way is more flexible in the long term IMO. If you decide to use the first then it may be worth changing the Save to return a bool to indicate success or failure to the calling code so it still has the option of retrying the Save operation.
DaveIf this helped, please vote & accept answer!
Binging is like googling, it just feels dirtier. (Pete O'Hanlon)
BTW, in software, hope and pray is not a viable strategy. (Luc Pattyn)
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DaveyM69 wrote: If the exception is of no consequence to external code
my english is not very good, i don't get what you mean by this
by the way i'm using llblgen
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I mean if the calling code will be able to continue regardless of specific exceptions then it's safe to catch these inside the save.
DaveIf this helped, please vote & accept answer!
Binging is like googling, it just feels dirtier. (Pete O'Hanlon)
BTW, in software, hope and pray is not a viable strategy. (Luc Pattyn)
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If "Save" can throw (or cause) exceptions that you can handle locally, then surround the method with a catch-block. Don't accomodate for exceptions that you cannot recover from - a "catch Exception" will also catch a EOutOfMemory - a general error that would best be handled in the global exception handler.
--edit--
I'm using the tooltips from intellisense to determine what exceptions to expect. Enter "System.IO.File.Re", and press <Ctrl>-<space>, and intellisense will pop up with the method ReadAllBytes. It also shows a tooltip, with a prototype of the method and a list of exceptions that the method can throw.
If there's anything in the list that you can handle, then do so. All other things should be left to the errorhandler[^].
I are Troll 
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The answer, of course, is it depends on many factors.
In your first option the Save() method should take some action if it catches an exception and then return a status to its calling method to tell it whether the function succeeded or not. However, in the second sample the calling method is expected to understand an SQL exception, whereas it should really only be expected to handle "Save exceptions". So in this case sample one is probably the better choice.
txtspeak is the realm of 9 year old children, not developers. Christian Graus
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the problem is that many exceptions are expected and returning a bool value is not enought to descripe
what error has been caught, so i need to handle in the function that calls save
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Hussam Fattahi wrote: i need to handle in the function that calls save
That's fine, I was only offering suggestions based on your original post. It all comes down to knowing what your program is doing and how it needs to react to exceptions. Only you can really decide where is the best place, based on your understanding of the code.
txtspeak is the realm of 9 year old children, not developers. Christian Graus
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thanks, your help is greetly appreciated
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Hussam Fattahi wrote: the problem is that many exceptions are expected and returning a bool value is not enought to descripe
what error has been caught, so i need to handle in the function that calls save
There is (probably) more than one place where you "save" data. Some things can be handled locally; you might want to handle a "reconnect" to the database and execute the query again. That's the thing that you should catch. All other things should be allowed to pass by.
You'd want two things to happen when an exception occurs; the user needs to know, and someone might be interested in the details of the exception later on.
First things first, the user needs to be informed that something went wrong. That's where the general error-handler comes in, it's a special event that traps all unhandled exceptions. From there you can show a message - without a stacktrace, explaining what went wrong in layman-terms, and explaining what countermeasures can be taken. This way, the user gets a "Disk Full" message, without every programmer checking each method individually and displaying their own windows. It's quite easy to display a helpfull message for the most common ones and to redirect the user to a helpfull webpage.
You'd probably want to log all the exceptions that you didn't handle; these should be treated as bugs. Log4Net could help you out there 
I are Troll
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You shouldn't do this:
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
unless you have a very good reason (e.g. this is a top-level exception handler). It is considered bad practise, you should catch known exception types, the code you have will "hide" unexpected exceptions (from testing etc).
Dalek Dave: There are many words that some find offensive, Homosexuality, Alcoholism, Religion, Visual Basic, Manchester United, Butter.
Pete o'Hanlon: If it wasn't insulting tools, I'd say you were dumber than a bag of spanners.
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i thought exception hiding is doing like this
catch (Exception ex)
{
}
and i'm not sure what specific exception will happen so i used the general exception
thanks
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An approach could be to put the SQLException within the Save() method and the general exception outside - that way SQLExceptions are caught in the Save method and anything else outside.
Me, I'm dishonest. And a dishonest man you can always trust to be dishonest.
Honestly. It's the honest ones you want to watch out for...
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