Error Handling

Sie Ste

15y2.4kC#

In a C#.net 2010 application that I am suppose to maintain (since I am new to working with this language), I find code that looks like the following:
try
{ //do something}
catch (ex){}
In the visual studio ide, I see a a curly green under the ex.
I also do not see any using statement that I would think applies.
Thus can you tell me if this kind of code really catches any errors? if so can you explain it to me?
I put this kind of code around some of my new code and everything falls into the catch block.
Thus can you tell me what a "good" try catch block should look like aand what namespace should be included in the
using statement?

3 Replies

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Sam Hobbs14y ago
What Usman Zafar said is good. Also look at the articles in this web site; there are many that can help also. For production programs it will help to have a methodology for showing messages to users in a manner that helps them understand problems they can fix and to report problems to you when they need your help.

Note that if you say something like "MessageBox.Show("Open error: " + ex.ToString());" then you will get the entire error; all the information, which might be too much for non-technical users but it can help you when you are debugging and such.
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Usman Zafar14y ago
It depends on what you want to do. In most cases you use something like this.
try
{
File.Delete(path);
}
catch(Exception ex)
{
MessageBox.Show(ex.Messsage);
}

But sometimes it can be like this:

try
{
File.Delete(path);
}
catch( FileNotFoundException ex)
{
MessageBox.Show("File does not exist");
}
catch( Exception ex)
{
MessageBox.Show(ex.Message);
}
finally
{
MessageBox.Show("Coming out of try catch block");
}
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Pravin More15y ago
Hi sie,

Make sure you have declared variable 'ex' like below..............
for e.g

try
{ //do something}
catch (Exception ex){}

n Exception class belongs to System namespace.
i.e using System

Thanks,
pravin

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0