Listview FocusedItem Always Null After Direct Assignment?
Oct 5, 2009
I have a form with two listviews. The second listview loads items based on the focused item of the first listview. I have the following code to check the items in the first listview:
If listView1.Items.Count > 0 Then
If myIndex > -1 Then
lstView1.Items.Item(0).Selected = True
[code]....
I have an object reference not set to an instance of object error caused by the line listView1.FocusedItem.EnsureVisible(), but the strange thing is that I have assigned the focused item property of the listview and also set the listview item to be focused by using focus method.
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Jun 21, 2010
I have face problem with null value i remove the chk from null value n sql server and when i direct save anything in table it dosen't accept null value but when i save these in my form it accept null value.
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Aug 13, 2011
I have being trying to learn VB.net in my own time.In the project I have two ListBox's.I want to click a button 'cmd1' and have the hightlight item name in one of the two ListBox's be passed to a MsgBox. [code] When I have a item selected in ListView2 and click the button, I get this error: "NullReferenceException was unhandled".It doesn't matter if i swap the code around like below, I still get the same error. [code]
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Feb 16, 2012
I've come across an error I'm not quite sure how to get rid of, I've got a listview with listview items making up the grid, I've got values coming from a database populating the cells however if there are any null values(in this case, there's null values in the date) it crashes my program. I'm not quite sure of a way to allow the listview to have null values in it, I figured it would default allow it but that's not the case.[code]....
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May 4, 2010
I have a ListView populated with colors one can choose to customize the UI a bit. I want the user to be able to click an item in the ListView and have it's BackColor become the BackColor of a picturebox (the "preview"). This is my
VB.NET
Private Sub listColors_ItemSelectionChanged(ByVal sender As System.Object, ByVal e As System.Windows.Forms.ListViewItemSelectionChangedEventArgs) Handles listColors.ItemSelectionChanged
clrPreview.BackColor = listColors.FocusedItem.BackColor
End Sub
If I try to select a different item with one already selected, I get "System.NullReferenceException was unhandled." How can I fix this?
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Aug 23, 2011
I have a database and I'm storing images in it along with a person's name, and other attributes. I've databound my listview with a stored procedure. I want to know how I can display an icon on a row depending on if the record for that row has a picture or not for the person...I'm not sure how to accomplish this however with the templates in asp.net
EDIT:
Here is my template and the s where I'm hoping to put them.
<ItemTemplate>
[code].....
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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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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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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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Oct 18, 2009
I am developing a web site in Visual Basic 2008 using .NET Frameworks 3.5 on an IIS7.0 web server and I am having a problem with a simple error page redirect. Furthermore I only have ftp access to the webserver in a web hosting environment. I am having problems with some errors and not others, mainly error 401 is the problem.<customErrors defaultRedirect="~/Default.aspx" mode="On" > </customErrors> this is the custom errors section of my [URL] file,
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Aug 26, 2011
I've d/l the DXSDK Jun10 version twice now and run the installation but I still can't find any reference to Direct Music (or even directx) in add reference. So how do you use direct music in VB.Net and W7?
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Sep 24, 2011
I have a school assignment and I just started to learn VB. Until now I/ve done pretty good however I encountered a problem which I can't solve in this assignment. So, I would ask if someone could tell me what I'm doing wrong?
This is the assignment:The application calculates the new hourly pay for each of three job codes, given the current hourly pay for each job code and the raise percentage (entered as a decimal number).
a.) before the form appears, use the InputBox function to prompt the personnel clerk to enter the raise percentage. You will use the raise percentage to calculate the new hourly pay for each job code.
[Code]...
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Jun 5, 2012
Concerning this code... Dim i1 As Integer = Nothing
[Code]...
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Nov 24, 2010
How do I direct help from MS support on line?
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Sep 14, 2009
How would I draw a Direct 3D Line in VB?
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Aug 4, 2009
[code]...
In this case, children includes all the Parent elements and all of the Child elements. What's the best way to grab only the direct descendants of <Root>?
Should I write a LINQ query that selects elements where parent = <Root>? Or is there some built-in method I'm missing that can get this for me?
EDIT: I had some confusion between XElement.Elements and XElement.Descendants. As Ruben Bartelink pointed out, XElement.Elements will give me exactly what I was looking for.
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Feb 16, 2010
I have an account in rapidshare. How can I get direct link from rapidshare link in vb.net?
Sample : [URL]
Direct link is : [URL]
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Nov 20, 2009
I have a new mac with a windows partition. Have been using for a few weeks and all is well on both partitions. I m now trying to install Cad on the windows side, but it says i need direct3d. I have no idea how to install or what i need to install it.
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Oct 9, 2009
I have developed a custom DirectX UI library equipped with everything from buttons to a gridview. I need a screen-layout editor of some sort. It just takes too long to do it by hand, whether through a config file or hard-coding. I could spend a month or two developing a DirectX editing utility, but I don't have a month or two to spend on this. I could possibly justify a week.
Some requirements:
I need to be able to create a new screen I need to place controls such as buttons, textboxes, and containers/windows/etc throughout the screen I need to adjust properties of these controls (Name, Text, Width, Height, Parent Container, etc)
Some of my ideas include:Using VB.NET's form editor... setting up forms and translating the form's control information into game screens.Setting up a web-based editor (seems like this would take more than week... wouldn't it have to be flash based?)Setup a VB.NET win32 editor that allows placement of .NET buttons, containers, etc that correspond to my library's buttons, containers, etc.Is there a best way to handle this?
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Apr 15, 2009
here's my problem.. i'm using a gridview control, and then i put a select column on the grid. My questions are, how to retrieve the data on one of the field in the gridview and then it will direct me to the another page.. (see example below)
[Code]...
once i click the "select" on the gridview, I will direct to another page(ex, Default.aspx) and then at the same time the value on "LastName" field of the corresponding row which i selected will display on the another page(ex, Default.aspx)
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Jan 30, 2011
I Know there are a few things i can use for graphics but I want to start a simple game in vb.net. GDI is to slow for a game so What is the modern equivalent to Direct X 11. I know Microsoft released a managed version of direct x long ago but It seems Out Dated now. I've heard about XNA but on their website it says it is used for windows phone and the Xbox
Which is currently the best and fastest equivalent to Direct x for Vb.net ?
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Mar 19, 2012
Is there a way to set a variable in VB.NET in an IF statement. I would like to do the following:
[Code]...
Is there some way I can get the last "ElseIf" to work? I know I can re-write it to get it to work but is there some syntax that will make it work the way it is?
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Aug 16, 2010
I'm having an odd problem with an ASP.Net page.I'm getting an object not set error message when assigning a string literal to a variable. [code] And here is the code that the error is pointing to. The last line in this fragment is the line 10 the error is complaining about [code] It seems it fails on accessing any reference type, even if it is declared locally in the load function. I originally found the problem when Request. IsSecureConnection was nulling out on me. I eventually discovered I could replace it with the above code and fail in the same way. The problem does not always happen. It seems to be triggered by publishing an update from Visual Studio, or when I head home for the day and the server sits idle all night. One or two app pool recycles seems to clear it up, and the page functions correctly. I've been doing desktop development for a few years, but I'm fairly new to web development.So maybe this is something obvious I've got configured wrong. I'm currently using .Net 4 on IIS 6. That code is in a foreach over an IEnumerable(of XElement). The stack trace still points to the string assignment, but all other stack traces are spot on, so I don't think it's a bad pdb.Also, when the error occurred this time, no amount of recycling the app pool or stopping and starting it would fix the error. I finally got it working again by switching the application to a different app pool.
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Apr 23, 2012
Why aren't the assignment operators (+=, -=, *=, /=) overloadable in VB.NET?
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Apr 4, 2011
If I put:
variableName = namecombobox.selectedItem
or
Dim variablename as type = namecombobox.SelectedIndex
Visual studio gives me the error: "Option Strict disallows conversions from object to string.
I can fix this by putting:
variableName = convert.ToString(namecombobox.SelectedItem)
Are all values contained in a combobox automatically treated as a non-string even when they are string values (in this case "Male" & "Female") and what is the correct way of assigning the value selected in a combobox to a variable?
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Jun 12, 2011
i am making a program on visual basic 2010 and part of my objective is to calculate the tax, i am trying to calculate the TAX so this is part of my code and this is the only part which gives me errors:[code]
1. Constant cannot be target of an assignment
2. value of type 'string' cannot be converted to 'System.windows.forms.Lebel'.
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Jun 21, 2010
I have an assign ment that says: create an application to let the user enter his or her name (first and last name), then displays the Initial in Upper Case. FOr example: you enter "John Wow", then the Label will display "JW". I know that I'm supposed to use the Substring method. But to use the Substring, I have to have the exact location of the Leter that is going to be displayed in the Label.The problem is: the name that the user enters always vary. So in strnewstring.Substring(... , ...) ---> the number in the parenthesis would vary, too. Thus, I cannot put a number in there.So how can i create a code for this particular assignment.
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Sep 26, 2011
i need to design a sudoku( 4*4 ) for my VB assignment..and i am having problem with generating random numbers for the four text boxes i have used..
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Sep 28, 2011
What is the difference between this two ways of returning value in a function in VB.NET?
Using Return Statement:
Public Function Foo() As String
Return "Hello World"
End Function
Using Assignment:
Public Function Foo() As String
Foo = "Hello World"
End Function
I'm using the first one then I saw someone using the second. I wonder if there's a benefit I could get using the second.
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Nov 17, 2010
Maybe this is a n00bish question, but I'm used to c++'s pointers and references and this is confusing me a bit. Let's say I have the following scenario in a VB.net application:
[Code]...
The situation is this: I have a collection of objects, and during execution of the program, any of them can be fetched from the collection to be used/edited by another part of the program. Now obviously if I edit the data inside the object it is allright, but what if I want to replace the object, as I did above at line 5? I would change only the local reference (y) but not the object inside the collection!
Is there a way around this? How can I take with me a "reference to the object's reference", instead of just a reference, so if I reassign it it will also reassign the one in the collection? I hope I'm making myself clear, unfortunately english is not my native language, to be clear: in c++ this would be easy using a pointer to a pointer, or passing a pointer to the object always by reference, so calling new or reassignment on it would change the original pointer itself)
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