VS 2008 Scrollbar In A Vb ListBox With 100000 Items?
May 8, 2009
Im trying to fill a ListBox with more than 65542 items in a Visual Basic .NET 2008 project. The ListBox seems capable to collect 100000 articles, but when i scroll through the list the scrollbar works till the 65500th listing (more or less) then it just jumps upwards.The weird thing is that I have two version of the same project which have different behaviors. One (tmp.zip) scroll fine with the scrollbar, but it doesn't with wheel mouse button.The other (listBox.zip), the scrollbar goes mad but mouse wheel seems ok
listobox.zip: is a new project created within VS 2008 tmp.zip: is a cleaned up form imported in VS 2008 from an early version (VS 2003?)
The scrollbar that comes with the ListBox is too small for touch screens, so I use my own scrollbar instead. But when you do this on various forms you end up repeating a lot of code. So my solution was to create a custom scollbar that has a property I can set to the control I want it to be a scrollbar for. In vb6, I can use the withevents keyword to get access to the control's events so that all the scrollbar related code can be in the custom scrollbar object I created, except...I had to create a refresh method for the consuming code to use to let the scrollbar know when the number of items changes. The scrollbar doesn't need to be told how many items there are because it has access to the control, but for a listbox there is no event to tie into when an item is added/removed so not 100% of the scrollbar related code could be encapsulated.
I am using VB.NET (version 2008). I have two types of items populating in a listbox (checked listbox). For example: lets say one is type "A" and other is "Type B". Their names maybe same so if the user sees those items in listbox then he won;t be able to determine their type until he click on them and checks out its properties. I wanted that I add each item to listbox and colour them so that blue for example means type "A" is there and red means the other. So this way I will be able to know at a glance that how many item of what type is present. I guess it may not be possible to do that in a standard checkedlistbox. I am also using component factory's krypton controls which enhance the gui of an application. But I dunno if I can progress using that.
probs a simple answer but my mind is blank atm. I have this code to move all items from listbox3 to listbox1 but it wont move them unless i select 1, then it moves all items.
I'm currently housing a ListView on a single form, and then adding buttons to this ListView via code-behind. Everything works wonderfully except the fact that when there are too many items added to the list it doesn't create a vertical scroll bar? I can simply add as many buttons as I want to it without it creating one? Here's the code that adds the button to the list: [Code]
I have a listbox which content is based on a treeview. When the user doubleclicks an item in the listbox the treeview will be updated and aftervards all the items in the listbox will be removed and the text of each TreeNode in the TreeView will be addedto the ListBox
I have a program where I have to read employee payroll info from a text file and write to a list box using a loop and then add the total payroll for all employees. Everything works except the adding of payroll.
I have been working on a much larger project and came to a point where I decided threading should be used.It seems in previous version of .Net, a background worker was able to update controls that were were not created on that thread. Now, it doesn't seem to be the case.I basically just began a new small project to try and teach myself the basics.Form1 Consists of A listbox, A progress bar, a label and two buttons, one to start and one to cancel.
imports system.threading private sub btngo(byval sender as system.object, byval e as system.eventargs) handles btngo.click pbprogress.minimum = 0[code=....
This code appears to be updating the listbox.I can see the vertical scrollbar getting smaller, but no data is shown in the listbox. The progressbar is also updating properly while that is working, indicating proper background operation.But what it's not doing is this:
1. Label is not updating percentage
2. The form is not free to be used by the user (me)
Very simply, I'm positioning a small ListBox over a DataGridView column when the user right-clicks and selects "Show Distinct Values". This works fine until the vertical scrollbar of the DataGridView is clicked. Once that's done the listbox pops up all the way over to the left edge of the DataGridView. As confirmation of the problem I created a small app to test with.
I have a single listbox that stores data from a saved .txt file. All of values are whole numbers and I'm trying to add together all the items in the listbox (the numbers) and then display them in a textbox. I have searched, and tried several things but each time I try to add them together, it states that my items are strings. How to sum listbox items and/or convert them out of strings?
How can I make listbox that contains items from some folder... For example: I have 10 .txt files in 1 folder. In my program when I click button "view" there is a listbox that contains names of that .txt files.
in a list box which is populated by the end user using this code
Dim lb1s As String = Form1.Folder.SelectedPath Dim di As New IO.DirectoryInfo(lb1s) Dim mydirInfoArray As IO.DirectoryInfo() = di.GetDirectories
[code]....
I have 3 text boxes i want to display the number of items in the list box which contain certain words,So for example in textbox1 i want it to display the total number of items in the list box which contain "(U) or [u] or [ntsc-u]" etc, this will be triggered via page load or a button which ever works best.
I have 3 columns, "Username", "Email","Password"and this is for a program I am making so people can sign up for my program and I will have a webpage to display the username email and passwords in a hidden input textbox. When the user loads the form it wll go to the website, get the text from the hidden textbox, and load it into a get all the emails and passwords and load them into a datagrid and under the appropriate columns. How do I add items to a column the same as I would with a listbox?
I am currently working on some tools and I am having some troubles adding new lines in a listbox.
vb.net For i = 0 To lstFiles.Items.Count - 1 Process.Start("C:UT2004Systemucc.exe", "compress " & lstFiles.Items.Item(i)) If IO.File.Exists(lstFiles.Items.Item(i) & ".uz2") Then
[Code].....
The meaning of this code is that if the file exists, it will add a new line called Success below the dragged fileline. If the file doesn't exist it will create a new line called Fail below the dragged fileline.
I have a simple application that take data of out a text file line by line and add to a listbox, and listbox display every single one. I want to display only 25 items at a time, such as every time I add a new item to listbox, it bumps off the oldest item displaying so the listbox only show 25 lines at a time. How do I accomplish this task?
i am in the middle of making a downloader. I almost have everything done, apart from this very simple thing to do which i cannot seem to figure out right.
I have a listbox thats full of about 300 items and i want all of those items to be copied over to a richtextbox. (one item per line with "www." in front of the item. does anyone know how to do this ? ive been searching around and trying for a while, but no luck
I have a listbox which gets populated by listing ftp directories, and when i list them, i have all items in listboxnow, i want toremove items that have extension different than .png .gif .bmp .jpg (or other image fromats)basically, i need to remove items that do not contain one of theese extensions in their name
I am making my own Anti-Virus and trying to get all the files but on that when it tries to scan it comes up with an error saying: Access to 'C:Documents and Settings' is Denied
im trying to write a queue window for an app... here is what i need to happen.on the form:4 listboxes that aren't visible to the user, 1 column each 1 listview with three columns: type, output file and status 7 buttons including: start, pause, abort, remove, open, save and clear when the user clicks start i want it to process all the items that are marked as ready in one of the listboxes, lstStatus.i was doing this with...
Dim count As Integer = lstStatus.Items.Count() Dim ready As String = "Ready" Dim i As Integer = 0 If count > 0 Then
[code].....
lstCommandLine is another one of the listboxes. i need to get the index of the lstStatus item that the loop is working on now which i will store in i. ill need to change the listview subitem from ready to complete and the lstStatus item from ready to complete as well. im guessing that would be in the same loop.
I have a listbox on my form which gets items added as the program progresses, when there are more items than the box can display, the vertical scrollbar appears, fine... so far so good.I would like the scrollbar default position to be at the bottom of it's column so that the last entered item is displayed but can't find the relevant command, I assume there is such a command.
I always have this problem. I have a textbox but is disabled and you can only input through a button. So, I want the input number "1000" to be like this, "1,000" but I don't know what code to put. Same thing with 100000 = 100,000
For example: test is a variable test = 1 How do I make that if test = 1 that a listbox fills with the items: red, blue, green, yellow? If test = 1 Then listbox1....
If strCustomerOrder = "A1#" Then decSubtotal = ANTACID_ONE mintQuantity += 1 ShoppingCartForm.lstShoppingCart.Items.Add(("A1" & vbTab & vbTab & "Alka-Seltzer Antacid" _ [Code] ..... I want my listbox to not display duplicate items. I just want it to update the quantity(Qty).
