Error Reporting?

When VB encounters an error does it have a number for each error or something... Like say I want to move a file, but it is in use so I can't... is that a different error then if the file didn't exist? I want to know so that I can display an error message accordingly. One other question, is it possible to open a folder in explorer from a VB .NET program? THanks in advance for any help on this topic.

Yes, there are error numbers for exceptions.

For example:

imports System.IO
....
Try
File.Move(path, path2)
Catch ex as FileNotFoundException
MsgBox("File Not Found")
Catch ex as System.IO.IOException
MsgBox(err.Number & " " & err.Description)
End Try

You can catch a specific exception, or a range of exceptions and then use Err class to get error number, error description, call stack e.t.c).

Oh, and to open a folder, you can call a Shell function

ProcID = Shell("""explorer"" C:\Some Folder", AppWinStyle.NormalFocus)

Yes, there are error numbers for exceptions.

For example:

imports System.IO
....
Try
File.Move(path, path2)
Catch ex as FileNotFoundException
MsgBox("File Not Found")
Catch ex as System.IO.IOException
MsgBox(err.Number & " " & err.Description)
End Try

You can catch a specific exception, or a range of exceptions and then use Err class to get error number, error description, call stack e.t.c).

Is there a catch for no errors? So that if it works it does what I want after that?

Also do you know where I can find a list of the errors that vb can encounter?

You can find a list of these errors in MSDN library
Look for example at this link: http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpref/html/frlrfsystemiofileclassmovetopic.asp

There is a list of all exceptions for Move method. You can find them for any method you need.

>Is there a catch for no errors? So that if it works it does what I want after that?

The code in Catch block will be only executed if an exception occurs. If there are no exceptions, this part of code will be skipped.