Help Help. I really need some help with this

[Guest]

Hi,
I have an application which was working fine then all of a sudden my users
are getting my custom error page. When I check the event log on web Server I
see

Event code: 3005
Event message: An unhandled exception has occurred.
Event time: 1/31/2007 1:23:08 PM
Event time (UTC): 1/31/2007 6:23:08 PM
Event ID: 07e688eeb1614408ad39b600cfd3e3d9
Event sequence: 8
Event occurrence: 1
Event detail code: 0

Application information:
Application domain: /LM/W3SVC/1/Root/myapp-1-128147413814374195
Trust level: Full
Application Virtual Path: /myapp
Application Path: D:\Sites\Beta\myapp\
Machine name: servername

Process information:
Process ID: 8860
Process name: w3wp.exe
Account name: NT AUTHORITY\NETWORK SERVICE

Exception information:
Exception type: ArgumentNullException
Exception message: Value cannot be null.
Parameter name: value

Request information:
Request URL: http://beta/myapp/Default.aspx
Request path: /myapp/Default.aspx
User host address: 1.1.1.1
User: DOMAIN\username
Is authenticated: True
Authentication Type: Negotiate
Thread account name: NT AUTHORITY\NETWORK SERVICE

Thread information:
Thread ID: 1
Thread account name: NT AUTHORITY\NETWORK SERVICE
Is impersonating: False
Stack trace: at System.Web.Caching.CacheEntry..ctor(String key,
Object value, CacheDependency dependency, CacheItemRemovedCallback
onRemovedHandler, DateTime utcAbsoluteExpiration, TimeSpan slidingExpiration,
CacheItemPriority priority, Boolean isPublic)
at System.Web.Caching.CacheInternal.DoInsert(Boolean isPublic, String
key, Object value, CacheDependency dependencies, DateTime
utcAbsoluteExpiration, TimeSpan slidingExpiration, CacheItemPriority
priority, CacheItemRemovedCallback onRemoveCallback, Boolean replace)
at System.Web.Caching.Cache.Insert(String key, Object value,
CacheDependency dependencies, DateTime absoluteExpiration, TimeSpan
slidingExpiration)
at Controls_Queue.Page_Load(Object sender, EventArgs e)
at System.Web.UI.Control.OnLoad(EventArgs e)
at System.Web.UI.Control.LoadRecursive()
at System.Web.UI.Control.LoadRecursive()
at System.Web.UI.Control.LoadRecursive()
at System.Web.UI.Page.ProcessRequestMain(Boolean
includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)


Custom event details:

For more information, see Help and Support Center at


The default.aspx page has one control on it. This is the entry code for that
control

Protected Sub Page_Load(ByVal sender As Object, ByVal e As
System.EventArgs) Handles Me.Load


_list = GetUserLocaations()

For Each l As String In _list
drpLocation.Items.Add(l)
Next

End Sub


please assist

 

[Guest]

Chris,
I'm not sure, but just looking at your code, could it be possible that the
getLocations method is returning a null value? Or is it returning a dynamic
list that may get updated seperately (i.e., if it is a list of directories
and someone else on the network deleted a folder, this could cause a problem).
Just a few ideas, I would try to step through the code and inspect the list
for null values.
Good luck!
- Mike

 

[Guest]

You are correct. This is the GetUserLocations() function


Public Function GetUserLocations()

Dim dr as SqlDatareader = ...

If dr.HasRows Then
Dim _list As New Generic.List(Of String)
While dr.Read
_list.Add(dr.Item("name"))
End While
Return _list
End If
Return Nothing

End Function

What is the best way to return an empty list?

 

[Guest]

Instead of returning Nothing return a new list that does not have any items
added to it.

See code below. You can probably also get rid of the test for dr.HasRows.
I think dr.Read will return false if no rows were returned by the
sqldatareader.

Jason Vermillion

Public Function GetUserLocations()

Dim dr as SqlDatareader = ...
Dim _list As New Generic.List(Of String)

If dr.HasRows Then
While dr.Read
_list.Add(dr.Item("name"))
End While
End If

Return _list

End Function