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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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?
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]....
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?
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#.
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.
View 1 RepliesI 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].....
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
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.
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?
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]....
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]....
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].....
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))
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.?
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]...
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.
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]....
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]...
What the title says! I see it from times to times and I'd like to know why. Is there any difference at all?
View 6 RepliesI 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
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.
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]....
View 3 Repliesim 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?
View 2 Repliesi 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]...
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]....
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].....
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).
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.
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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