I'm relatively familiar with asp.net and vb.net and have been working in
the environment for several years. I've dealt with null reference errors
before and generally know how to code around them
But now I have some new code I deployed and I'm getting a null reference
error when looping through a datatable (for each r in dt.rows...).
I'm expecting to find an integer in this field, or possibly nothing, or
possibly a dash (-).
So I added some extra stuff to figure out what's in there (I don;t have
access to the same dataset where this is running, or I'd just use the
debugger). I made this block of code to help me figure it out:
If IsNumeric(Trim( r("qty_rem")) ) Then 'Trim(r("qty_re m")) <"-" And
Trim(r("qty_rem ")) <"" Then
Dim iRem As Int16
Try
iRem = Convert.ToInt16 (Trim(r("qty_re m")))
Catch ex As Exception
If Not IsNothing(r("qt y_rem")) Then
Current.Session ("lastError" ) = "r(qty_rem) = '" & r("qty_rem") & "'"
& vbCrLf & ex.Message & vbCrLf & ex.InnerExcepti on.Message
Current.Respons e.Redirect("err or.aspx")
Else
Current.Session ("lastError" ) = "r(qty_rem) is nothing" & vbCrLf &
ex.Message & vbCrLf & ex.InnerExcepti on.Message
Current.Respons e.Redirect("err or.aspx")
End If
End Try
And now instead of redirecting to my error page and showing me what is
in there, it crashes on the line where it tries to assign values to the
"lastError" session variable. But it passes If not isNothing() and
IsNumeric(). I don't get it. Can anyone see the problem in finding out
what is in this dataset? Thanks!
Matt
5  1508 
try testing if r("qty_rem") is nothing first
"MattB" <so********@yah oo.comwrote in message
news:5n******** ****@mid.indivi dual.net...
I'm relatively familiar with asp.net and vb.net and have been working in
the environment for several years. I've dealt with null reference errors
before and generally know how to code around them
But now I have some new code I deployed and I'm getting a null reference
error when looping through a datatable (for each r in dt.rows...).
I'm expecting to find an integer in this field, or possibly nothing, or
possibly a dash (-).
So I added some extra stuff to figure out what's in there (I don;t have
access to the same dataset where this is running, or I'd just use the
debugger). I made this block of code to help me figure it out:
If IsNumeric(Trim( r("qty_rem")) ) Then 'Trim(r("qty_re m")) <"-" And
Trim(r("qty_rem ")) <"" Then
Dim iRem As Int16
Try
iRem = Convert.ToInt16 (Trim(r("qty_re m")))
Catch ex As Exception
If Not IsNothing(r("qt y_rem")) Then
Current.Session ("lastError" ) = "r(qty_rem) = '" & r("qty_rem") & "'" &
vbCrLf & ex.Message & vbCrLf & ex.InnerExcepti on.Message
Current.Respons e.Redirect("err or.aspx")
Else
Current.Session ("lastError" ) = "r(qty_rem) is nothing" & vbCrLf &
ex.Message & vbCrLf & ex.InnerExcepti on.Message
Current.Respons e.Redirect("err or.aspx")
End If
End Try
And now instead of redirecting to my error page and showing me what is in
there, it crashes on the line where it tries to assign values to the
"lastError" session variable. But it passes If not isNothing() and
IsNumeric(). I don't get it. Can anyone see the problem in finding out
what is in this dataset? Thanks!
Matt
Thanks for responding!
I'm doing that in this snippet below in the catch block and it passes
(it's not nothing). Then it errors where I'm assigning relevant info to
the session variable.
Any other ideas? I really do appreciate the response!
Matt
IfThenElse wrote:
try testing if r("qty_rem") is nothing first
"MattB" <so********@yah oo.comwrote in message
news:5n******** ****@mid.indivi dual.net...
>I'm relatively familiar with asp.net and vb.net and have been working in
the environment for several years. I've dealt with null reference errors
before and generally know how to code around them
But now I have some new code I deployed and I'm getting a null reference
error when looping through a datatable (for each r in dt.rows...).
I'm expecting to find an integer in this field, or possibly nothing, or
possibly a dash (-).
So I added some extra stuff to figure out what's in there (I don;t have
access to the same dataset where this is running, or I'd just use the
debugger). I made this block of code to help me figure it out:
If IsNumeric(Trim( r("qty_rem")) ) Then 'Trim(r("qty_re m")) <"-" And
Trim(r("qty_re m")) <"" Then
Dim iRem As Int16
Try
iRem = Convert.ToInt16 (Trim(r("qty_re m")))
Catch ex As Exception
If Not IsNothing(r("qt y_rem")) Then
Current.Sessio n("lastError" ) = "r(qty_rem) = '" & r("qty_rem") & "'" &
vbCrLf & ex.Message & vbCrLf & ex.InnerExcepti on.Message
Current.Respon se.Redirect("er ror.aspx")
Else
Current.Sessio n("lastError" ) = "r(qty_rem) is nothing" & vbCrLf &
ex.Message & vbCrLf & ex.InnerExcepti on.Message
Current.Respon se.Redirect("er ror.aspx")
End If
End Try
And now instead of redirecting to my error page and showing me what is in
there, it crashes on the line where it tries to assign values to the
"lastError" session variable. But it passes If not isNothing() and
IsNumeric(). I don't get it. Can anyone see the problem in finding out
what is in this dataset? Thanks!
Matt
May be your ex.InnerExcepti on.Message is nothing. check it out.
I use,
If Not ( r("qty_rem") is nothing ) then
may be the same as NOT IsNothing(etc.. )
"MattB" <so********@yah oo.comwrote in message
news:5n******** ****@mid.indivi dual.net...
Thanks for responding!
I'm doing that in this snippet below in the catch block and it passes
(it's not nothing). Then it errors where I'm assigning relevant info to
the session variable.
Any other ideas? I really do appreciate the response!
Matt
IfThenElse wrote:
>try testing if r("qty_rem") is nothing first
"MattB" <so********@yah oo.comwrote in message
news:5n******* *****@mid.indiv idual.net...
>>I'm relatively familiar with asp.net and vb.net and have been working in
the environment for several years. I've dealt with null reference errors
before and generally know how to code around them
But now I have some new code I deployed and I'm getting a null reference
error when looping through a datatable (for each r in dt.rows...).
I'm expecting to find an integer in this field, or possibly nothing, or
possibly a dash (-).
So I added some extra stuff to figure out what's in there (I don;t have
access to the same dataset where this is running, or I'd just use the
debugger). I made this block of code to help me figure it out:
If IsNumeric(Trim( r("qty_rem")) ) Then 'Trim(r("qty_re m")) <"-" And
Trim(r("qty_r em")) <"" Then
Dim iRem As Int16
Try
iRem = Convert.ToInt16 (Trim(r("qty_re m")))
Catch ex As Exception
If Not IsNothing(r("qt y_rem")) Then
Current.Sessi on("lastError" ) = "r(qty_rem) = '" & r("qty_rem") & "'" &
vbCrLf & ex.Message & vbCrLf & ex.InnerExcepti on.Message
Current.Respo nse.Redirect("e rror.aspx")
Else
Current.Sessi on("lastError" ) = "r(qty_rem) is nothing" & vbCrLf &
ex.Message & vbCrLf & ex.InnerExcepti on.Message
Current.Respo nse.Redirect("e rror.aspx")
End If
End Try
And now instead of redirecting to my error page and showing me what is
in there, it crashes on the line where it tries to assign values to the
"lastError" session variable. But it passes If not isNothing() and
IsNumeric() . I don't get it. Can anyone see the problem in finding out
what is in this dataset? Thanks!
Matt
if it null in the database, r("qty_rem") returns DBNull, not null (nothing).
-- bruce (sqlwork.com)
MattB wrote:
I'm relatively familiar with asp.net and vb.net and have been working in
the environment for several years. I've dealt with null reference errors
before and generally know how to code around them
But now I have some new code I deployed and I'm getting a null reference
error when looping through a datatable (for each r in dt.rows...).
I'm expecting to find an integer in this field, or possibly nothing, or
possibly a dash (-).
So I added some extra stuff to figure out what's in there (I don;t have
access to the same dataset where this is running, or I'd just use the
debugger). I made this block of code to help me figure it out:
If IsNumeric(Trim( r("qty_rem")) ) Then 'Trim(r("qty_re m")) <"-" And
Trim(r("qty_rem ")) <"" Then
Dim iRem As Int16
Try
iRem = Convert.ToInt16 (Trim(r("qty_re m")))
Catch ex As Exception
If Not IsNothing(r("qt y_rem")) Then
Current.Session ("lastError" ) = "r(qty_rem) = '" &
r("qty_rem") & "'" & vbCrLf & ex.Message & vbCrLf &
ex.InnerExcepti on.Message
Current.Respons e.Redirect("err or.aspx")
Else
Current.Session ("lastError" ) = "r(qty_rem) is nothing" &
vbCrLf & ex.Message & vbCrLf & ex.InnerExcepti on.Message
Current.Respons e.Redirect("err or.aspx")
End If
End Try
And now instead of redirecting to my error page and showing me what is
in there, it crashes on the line where it tries to assign values to the
"lastError" session variable. But it passes If not isNothing() and
IsNumeric(). I don't get it. Can anyone see the problem in finding out
what is in this dataset? Thanks!
Matt
good point
"bruce barker" <no****@nospam. comwrote in message
news:eK******** ******@TK2MSFTN GP04.phx.gbl...
if it null in the database, r("qty_rem") returns DBNull, not null
(nothing).
-- bruce (sqlwork.com)
MattB wrote:
>I'm relatively familiar with asp.net and vb.net and have been working in
the environment for several years. I've dealt with null reference errors
before and generally know how to code around them
But now I have some new code I deployed and I'm getting a null reference
error when looping through a datatable (for each r in dt.rows...).
I'm expecting to find an integer in this field, or possibly nothing, or
possibly a dash (-).
So I added some extra stuff to figure out what's in there (I don;t have
access to the same dataset where this is running, or I'd just use the
debugger). I made this block of code to help me figure it out:
If IsNumeric(Trim( r("qty_rem")) ) Then 'Trim(r("qty_re m")) <"-" And
Trim(r("qty_re m")) <"" Then
Dim iRem As Int16
Try
iRem = Convert.ToInt16 (Trim(r("qty_re m")))
Catch ex As Exception
If Not IsNothing(r("qt y_rem")) Then
Current.Session ("lastError" ) = "r(qty_rem) = '" &
r("qty_rem") & "'" & vbCrLf & ex.Message & vbCrLf &
ex.InnerExcept ion.Message
Current.Respons e.Redirect("err or.aspx")
Else
Current.Session ("lastError" ) = "r(qty_rem) is nothing" &
vbCrLf & ex.Message & vbCrLf & ex.InnerExcepti on.Message
Current.Respons e.Redirect("err or.aspx")
End If
End Try
And now instead of redirecting to my error page and showing me what is in
there, it crashes on the line where it tries to assign values to the
"lastError" session variable. But it passes If not isNothing() and
IsNumeric(). I don't get it. Can anyone see the problem in finding out
what is in this dataset? Thanks!
Matt
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