Throw exception from one method to another in VB.NET

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I am trying to throw exception from one method to another by that if any error occures then the main method will print it in message box. I have already done in c# but trying to write same in vb.net but always giving error when i throw it to another method.Thanks in advance for help.

shwoing this error "

Conversion from string "a" to type 'Integer' is not valid.'

"

What I have tried:

Public Async Function test() As Task(Of DataSet)

Try

Dim ds As New DataSet

Dim a, b As Integer
a = "a"
b = 7
Dim c = a / b

Await Task.Run(Function() adapter.Fill(ds))

Catch ex As Exception
Throw
End Try

Return ds

End Function

Posted 30-Sep-20 22:41pm

Prashant Sharma

Updated 30-Sep-20 23:31pm

v2

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Comments

Richard MacCutchan 1-Oct-20 5:08am

" always giving error"
Then please tell us what the error is!

Prashant Sharma 1-Oct-20 5:17am

Conversion from string "a" to type 'Integer' is not valid.'

Richard MacCutchan 1-Oct-20 5:18am

What part of that do you not understand?

Prashant Sharma 1-Oct-20 5:24am

sir i understand this error but i want to throw this error to the another method by which i can print it on a message.

Richard MacCutchan 1-Oct-20 5:27am

You cannot, because that is a compiler error, not a runtime exception. You need to generate a proper exception: see Handling and throwing exceptions in .NET | Microsoft Docs[^].

Prashant Sharma 1-Oct-20 5:37am

ok sir i will read this article but i am confuse that i have write same type code in c# and if any error comes in then it throw to the main method.

Richard MacCutchan 1-Oct-20 7:16am

When you create a method that may throw or cause an exception then put it in a Try/Catch block - standard practice. But you then need to check which exceptions may be thrown, so catch those ones first. Using a Catch for all exceptions and then rethrowing them is all rather pointless, you may just as well let your application crash. But for specific exceptions you should consider what you can do: can you recover, do you need to save some information, if you post a message can the user take any useful action, etc.?

Prashant Sharma 1-Oct-20 9:58am

sir thank u very very much for the solution

Richard MacCutchan 1-Oct-20 10:21am

You are welcome.

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OriginalGriff · Answer 1 · 2020-09-30T23:31:00

Unless you are also catching exceptions in the code that calls that method, it is doing exactly what it you told it to: throwing an exception, which the debugger or executing app is finding unhandled so it breaks your code.

To be honest, your whole Try block is redundant: since all you do it catch every exception type and rethrow it, you could remove the Try, Catch, Throw, and End Try with no change at all in the outcomes!