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Server.GetLastE rror

VK
Hello,

I am trying to get the last occured error via the
following code:

Sub Page_Load(...)
Dim zero As Integer = 0
Try
Dim err As Integer = 10 / zero
Catch ex As Exception
End Try

Response.write( Server.GetLastE rror.Message)
End Sub

However the above code always throws an error at the
response.write line with:

Object reference not set to an instance of an object.

Anybody knows why this is happening?
Nov 19 '05 #1
4 4141
Well, first off 10/0 will not throw an error. I also assume you must have
Option Strict Off or your code would not even compile: err would need to be
dimmed as a double or you would need ctype(10/zero, double) for code to
compile.

I think GetLastError only returns the last unhandled error, during the
current context, and I think the page's Page_Error event or global.asax
Application_Err or event has to be raised to access it. Once one of those
events is raised Server.GetLastE rror is available anywhere in your
code...for the remainder of the current context / request

Example:

Private Sub Page_Load(ByVal sender As System.Object, ByVal e As
System.EventArg s) Handles MyBase.Load
Dim zero As Integer = 0
Dim err As Double = 10 / CType("x", Integer)
End Sub

Private Sub Page_Error(ByVa l sender As Object, ByVal e As System.EventArg s)
Handles MyBase.Error
Response.Write( Server.GetLastE rror.Message)
End Sub

Or since it's now available anywhere, you could also do something like this:

Private Sub Page_Error(ByVa l sender As Object, ByVal e As System.EventArg s)
Handles MyBase.Error
Server.Transfer ("error.aspx ")
End Sub

And then in error.aspx

Private Sub Page_Load(ByVal sender As System.Object, ByVal e As
System.EventArg s) Handles MyBase.Load
Response.Write( Server.GetLastE rror.Message)
End Sub

"VK" <an*******@disc ussions.microso ft.com> wrote in message
news:0d******** *************** *****@phx.gbl.. .
Hello,

I am trying to get the last occured error via the
following code:

Sub Page_Load(...)
Dim zero As Integer = 0
Try
Dim err As Integer = 10 / zero
Catch ex As Exception
End Try

Response.write( Server.GetLastE rror.Message)
End Sub

However the above code always throws an error at the
response.write line with:

Object reference not set to an instance of an object.

Anybody knows why this is happening?

Nov 19 '05 #2
Well, first off 10/0 will not throw an error. I also assume you must have
Option Strict Off or your code would not even compile: err would need to be
dimmed as a double or you would need ctype(10/zero, double) for code to
compile.

I think GetLastError only returns the last unhandled error, during the
current context, and I think the page's Page_Error event or global.asax
Application_Err or event has to be raised to access it. Once one of those
events is raised Server.GetLastE rror is available anywhere in your
code...for the remainder of the current context / request

Example:

Private Sub Page_Load(ByVal sender As System.Object, ByVal e As
System.EventArg s) Handles MyBase.Load
Dim zero As Integer = 0
Dim err As Double = 10 / CType("x", Integer)
End Sub

Private Sub Page_Error(ByVa l sender As Object, ByVal e As System.EventArg s)
Handles MyBase.Error
Response.Write( Server.GetLastE rror.Message)
End Sub

Or since it's now available anywhere, you could also do something like this:

Private Sub Page_Error(ByVa l sender As Object, ByVal e As System.EventArg s)
Handles MyBase.Error
Server.Transfer ("error.aspx ")
End Sub

And then in error.aspx

Private Sub Page_Load(ByVal sender As System.Object, ByVal e As
System.EventArg s) Handles MyBase.Load
Response.Write( Server.GetLastE rror.Message)
End Sub

"VK" <an*******@disc ussions.microso ft.com> wrote in message
news:0d******** *************** *****@phx.gbl.. .
Hello,

I am trying to get the last occured error via the
following code:

Sub Page_Load(...)
Dim zero As Integer = 0
Try
Dim err As Integer = 10 / zero
Catch ex As Exception
End Try

Response.write( Server.GetLastE rror.Message)
End Sub

However the above code always throws an error at the
response.write line with:

Object reference not set to an instance of an object.

Anybody knows why this is happening?

Nov 19 '05 #3
Since you are catching the exception, it is no longer an error.

bill

"VK" <an*******@disc ussions.microso ft.com> wrote in message
news:0d******** *************** *****@phx.gbl.. .
Hello,

I am trying to get the last occured error via the
following code:

Sub Page_Load(...)
Dim zero As Integer = 0
Try
Dim err As Integer = 10 / zero
Catch ex As Exception
End Try

Response.write( Server.GetLastE rror.Message)
End Sub

However the above code always throws an error at the
response.write line with:

Object reference not set to an instance of an object.

Anybody knows why this is happening?

Nov 19 '05 #4
Hello VK,

If this code would generate an error (which it wont as detailed by Brad),
you're swallowing it anyways. You need to remove the try/catch.

--
Matt Berther
http://www.mattberther.com
Hello,

I am trying to get the last occured error via the following code:

Sub Page_Load(...)
Dim zero As Integer = 0
Try
Dim err As Integer = 10 / zero
Catch ex As Exception
End Try

Response.write( Server.GetLastE rror.Message)
End Sub
However the above code always throws an error at the response.write
line with:

Object reference not set to an instance of an object.

Anybody knows why this is happening?

Nov 19 '05 #5

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