Mvc - Why Is Sitemap.CurrentNode Null

Nov 9, 2009

System.NullReferenceException: Object reference not set to an instance of an object. Making the Sitemap.CurrentNode work in my code is oddly a problem. I haven't figured out how to list code on STOF yet. so here is the code that will easily be displayed. [Code]

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.net - Asp.net More Than One Sitemap?

Apr 7, 2011

I am having an issue with the sitemap control, I have added the hierarchical levels within the web.sitemap file and added the sitemap control to the various masterpages. I have however two homepages which can be viewed depending on the user of the system.

Is there any way to define two sitemap structures within this web.sitemap file or can I just create another sitemap file?

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C# - How To Read A Sitemap

Feb 21, 2012

I have been trying to open the following XML file in VB.NET using the Linq library.

<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet type="text/xsl" href="http://wegotflash.com/sitemap.xsl"?>
<urlset xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.sitemaps.org/schemas/sitemap/0.9

[code]....

The code that I'm using works with normal XML files, but whenever I add the xmlns="http://www.sitemaps.org/schemas/sitemap/0.9" attribute to the root node, nothing is getting returned by the application. Here is the VB.NET code that is reading the XML file:

Dim XMLFile As XDocument = XDocument.Load(TextBox1.Text)
For Each url As XElement In XMLFile.Descendants("url")

[code]....

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Asp.net SiteMap Menu Using CSS And JQuery?

Mar 5, 2011

I am using asp.net sitemap with the in-built asp.net menu but this is very 'dull'. I want to apply CSS and jQuery to give it a better visual look and feel. I have read various articles based on [URL]

Is there any examples or tutorials similar to this which are FREE?

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Dynamically Rename A Node In A ASP.NET Sitemap?

Jan 30, 2011

On our site, we have our sitemap in this order:

SiteName > SelectedProject > Path > To > Page

Where SiteName takes you to the very root page which is primarily to select a project and SelectedProject takes you to the project's homepage.Currently, in the Web.sitemap file, SelectedProject has a static name. How can I rename it to the name of the selected project, which can be obtained from Session("PRJ")? I'd strongly prefer any code behind to be given in VB.NET, not C#.

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Efficiently Loading Sitemap From Database?

Jan 13, 2010

i have a custom SiteMapProvider which I populate from a database. I also have a custom SiteMapNode which has to be constructed with a custom Page argument.[code]Should I return false in AuthorizeCore() to have everything work according to default authorization protocols? (What are these?) Or should I throw my exception.SiteMap.CurrentNode is Null / Nothing (in AuthorizeCore()) if the page which is requested is not accessible to the user (obviously). How should I change my implementation? I want to keep the functionality that the Page objects are only loaded once, so I need to store them somewhere.

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VS 2005 Sitemap Using Recursive Programming?

Aug 20, 2009

I have a dynamic website that shows articles. Any article can have sub articles and sub articles can have sub articles etc. I have wrote a routine that recursively goes through the data creating a new sitemap xml file. My problem is this:-

Art1
SubArt1a
SubArt1aa

[code].....

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Asp.net Mvc - Handle Application Security Using ActionFilterAttribute And/or SiteMap Authorization?

Jan 12, 2010

i created the following ActionFilterAttribute to check if a user is granted access to a page. I also created two custom Exceptions to handle different scenarios: NotLoggedInException and InsufficientPrivilegeException.

[Code]...

Where do I catch the exceptions to for instance redirect users if not authorized?Should I perhaps use the SiteMap authorization somewhere else instead of using the ActionFilterAttribute and throwing Exceptions..?

note: as you can see I'm using a custom class for BLL.Page. This is a ORM page which has Role based security stored in the database. SiteMap is also populated based on this data

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How To Make Sitemap Based Menu With Only Top Level Elements

Jun 23, 2009

I'm trying to make a menu based off of an asp.net sitemap. How do you nest the sitemap nodes so that they all appear on the same level. Here is what I have:
<siteMap xmlns="[URL]" >
<siteMapNode>
<siteMapNode url="~/Default.aspx" title="Home" description="link to Home" />
<siteMapNode url="~/about.aspx" title="About" description="abot" />
</siteMapNode></siteMap>

Here is what the code for the Menu control looks like:
<asp:Menu ID="Menu1" runat="server" BackColor="#E3EAEB"
DataSourceID="SiteMapDataSource1"
</asp:Menu>
They both appear as 2nd tier elements underneath an arrow.

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Null Reference Exception In Line Checking For Null?

Dec 15, 2011

I have a fairly simple piece of code:

Private _PurchaseDelivery as PurchaseDelivery
Protected Overrides Sub InsertItem(ByVal index As Integer, ByVal item As PurchaseDeliveryItem)

[Code]....

Which is inside a class which overrides a custom list base. The code is occassionaly throwing an unhandled exception, System.NullReferenceException, on this line when used in production:

If _PurchaseDelivery IsNot Nothing AndAlso _PurchaseDelivery.DefaultSKUBinID.HasValue Then

DeafultSKUBinID is declared as an Integer? (Nullable Int) in the PurchaseDelivery class. I cannot see what might be causing this error, why would this be returning an error?

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Linq To Sql Null - Check Whether A Column Is Null

Jul 15, 2011

How to check whether a column is null i use the following code but I got this error "Input string was not in a correct format."

[Code]....

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SQL Exception (adding A Null Value To A Non-null Column)

Aug 12, 2009

When I put a break point to the last if clause in the sub ("If (backOrder < 0) Then", see below) it runs until the break point, if I put the break point further below, I get the following error:

Cannot insert the value NULL into column 'OrderID', table 'WHM.dbo.OrderDetails'; column does not allow nulls. INSERT fails. The statement has been terminated.

I've discovered first hand that it only happens when prodqty is bigger then qtyOnStock, thus executing the if clause.

The code:

Private Sub NCOSubmit_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles NCOSubmit.Click
Dim sqlText As String = ""

[Code]....

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Error 'Arguement Null Exception Was Unhandled, Column Arguement Cannot Be Null'?

Oct 20, 2011

I am trying to create a treeview in VB.net, the data has to be loaded from MSAccess 2010 database. When I try to run this program I get error : Argument Null Exception was unhandled, 'column' argument cannot be null and the program crashes. I have pasted the code as under:

Imports System.Data.OleDb
Public Class frmRating
Private Sub frmRating_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles

[code].....

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Null Check Always Returns Null, If Removed Returns Object Reference Not Set To An Instance Of An Object

Jun 24, 2010

I have some code which gets child items for a menu via the GetChildren function which takes a list of menuData: Dim builtMenu As New List(Of MenuData)(_rawData.FindAll(Function(item) item.GroupingID = 0))

For Each menuData As MenuData In builtMenu
If menuData.Children IsNot Nothing Then
menuData.Children.AddRange(GetChildren(menuData))
End If
Next

If I check if menudata.children isnot nothing, it always is nothing because the GetChildren function is yet to run (providing the child items, which do exist). If I remove this check and just have this code:

Dim builtMenu As New List(Of MenuData)(_rawData.FindAll(Function(item) item.GroupingID = 0))

For Each menuData As MenuData In builtMenu
menuData.Children.AddRange(GetChildren(menuData))
Next

Then I am presented with a Object reference not set to an instance of an object error on menuData.Children.AddRange(GetChildren(menuData))

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.net - Asp.net With Null Cookie?

Nov 25, 2010

I'm having problems writing an If statement because it's asking for the value of a cookie, but it's possible that the cookie could be null which breaks the page.

Here's the code:If Request.Cookies("myCookie").Value = "1234" then'do stuff End If

I think i need an elegant way of say "If myCookie is not null and has a value of..."

[Code]...

Basically the cases are always going to be the same but it will select the case from one of 2 places depending on whether myCookie has a value. Since there may be quite a few cases is there anyway I can get away with only listing them once.?

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.net - Null Check In VB?

Apr 7, 2011

All I want to do is check if an object is null, but no matter what I do, if it compiles, it throws a NullReferenceException just trying to check! Here's what I've done:

[Code]...

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.net - Null Reference But It's Not?

Jun 2, 2010

This is related to my previous question but it is a different problem.I have two classes: Server and Database.

[Code]...

The problem is in the LoadTables in the Server class. When it hits Databases.Add(db) it gives me a NullReference error (Object reference not set). I don't understand how it is getting that, all the objects are set.

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Asp.net - Session Becoming Null?

Jun 4, 2012

We have implemented exam on a single page and store the option in view state as users selects the same. On select of next question page is loaded again. Sometime "If Session("User") = """ turns out true and user logs out.I did setup session on first time page load as

Session.Timeout = 340

Also in web config file session timeout is 2 hours.

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
If Session("User") = "" Then
Response.Redirect("Default.aspx")

[code]....

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C# - LINQ To SQL Sum Null Value?

Aug 20, 2010

I have the following query, I'd like to sum the NULL value also. Some TimeSheet don't records in TimeRecord and some tr.TimeIn and tr.TimeOut are NULL.The query select only TimeSheet that has reords in TimeRecord. How I can have it select everything, and sum up the NULL value as well. So, the SUM of NULL will be just zero.

[Code]...

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C# - Why Null == MyVar Instead Of MyVar == Null

Sep 20, 2009

What the title says! I see it from times to times and I'd like to know why. Is there any difference at all?

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Check For NULL And For Zero?

Apr 8, 2011

I have a dataset. I'd like to check if one item in the dataset is null or zero.

If IsDBNull(ds.Tables(0).Rows(0)("TotalCostPerUnit")) or CInt(ds.Tables(0).Rows(0)("TotalCostPerUnit") = 0 Then
Exit Sub
end if

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Check For Null Value?

Sep 30, 2009

Dim Conn As ADODB.Connection
Dim Null As String
Dim NullRecordset As ADODB.Recordset

[code]....

Im trying to check my database for a null value. If the database is null, then I want it to start the timer, otherwise I want it to skip over some stuff and automatically load the main form.

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Check If DB Null?

Oct 27, 2011

I am trying to check to see if a DataSet is null or not. If it is I would like to show a MessageBox. For some reason it is not recognizing null returns and skipping the message box and going right to the Else commands. [code]....

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Equivalent Of Null In VB?

Mar 30, 2009

im using a quesry which returs the max value from a table the issue is the line cmd.ExecuteScalar() may return a value null if there are no records , is there any eway to chk if value returned is null or not?

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For Each ... Get Next Null Error

Feb 27, 2009

i am trying to find the loctaion of an item in an array but ecah time i run the for each next loop i get a null error. code follows:

[Code]...

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Handle SQL Null In .NET?

Jan 19, 2009

I read stuff from a SQL DB (database) using a data set. Some of the columns in the DB may contain NULL. I want to go through the table in the dataset and print, or use in some other way, the data. But when I try to use a certain data that corresponds to a NULL in the DB my program crashes.How can I detect - in the dataset - that it has no value and that I shouldn't try to use it?

Private Sub Get�rendenLista(ByVal e As System.EventArgs)
'----------------------------------------------------------------------
' This function fetches a list of �rende from the table �rende
'----------------------------------------------------------------------
Dim cno As New SqlConnection

[code]....

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How To Case A Null Value

Mar 11, 2010

until i put in On Error Resume Next i was getting runtime error 94 in vaild use of null

i would like to have something like case null: Result = " Unknown"
Function GetPingStatus(ByVal StatusCode As Long)
On Error Resume Next

[code].....

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How To Check DB Null Value

Aug 13, 2010

I have a problem with verifying db null value. Actually I don't know the syntax.
Here is the code.
If Not IsDBNull(Me.DeliveryReviewDataSet.Delivery(Me.CustomerIDListBox.SelectedIndex).Signature) Then
"Signature" is the image field (binary data).

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How To Check For Null Value

Jun 29, 2010

Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
If MyBase.Dispose(disposing) <> DBNull.Value Then
Dispose() = DBNull.Value

[Code]....

I am getting error

1) Expression does not produce a value.

2)Expression is a value and therefore cannot be the target of an assignment.

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How To Set Proxy To Null

Mar 8, 2009

I am using webclient to get and send various information through my vb.net application.All of the code works fine, except that whenever the webclient is used, it seems to lock-up the application (as if its going to crash) but then recovers after it has recieved/send the required data.I have googled around, and apparently i need to set the proxy to null (which is fine because i dont use a proxy anyway) but i dont know how do do this.Could anyone tell me how to set the proxy to null please?

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