'Form 1- start a new thread and declare a new second form. Have it invoke before adding an entry. as this apart from "CheckForIllegalCrossThreadCalls = false" is a workaround.
Code:
Public Class Form1
Dim t As New Thread(AddressOf startanew)
Private Sub startanew()
[Code].....
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.
View 5 RepliesHow can you add items to a listbox on a form? Also this needs to be included so if another item is added by user it will be added directly to database.
Reason i am asking that is my project has to work in cojunction with Oracle Plus.
So far if i remember it is something like
.Add("Horror")
.Add("Romance")
I'm unsure if that is correct but i want the items to appear so the user can select one from list.
I think you have to include a data reader but don't mind that i can handle that. All i want is to add items to listbox when form loads.
I have two forms with one listbox on each form. How can I show what I have in the listbox on form1 on form2. I have a button on form1 to go to form2.
Private Sub btnform2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnform2.Click
Form2.Show()
Dim sTemp As String = TextBox1.Text & ":" & textbox2.Text & ":" & textbox3.Text & ":" & textbox4.Text & ":" & textbox5.Text
Form2.ListBoxFonts.Items.Add(sTemp) 'add to the listbox
End Sub
But when I click the button it goes to the form2 but it only shows one list and nothing else. When I go to form1 to add another list, it comes up with the listbox on form2 with two list, but when I go to my form2, it only shows the latest one I put in, it never shows two or more list, its probably just one line of code.
Our chapter is all on printing, but the teachers example sends the data to a new form, into a listbox. How do I take the contents of a ComboBox from one form and input it into the ListBox on another form, first adding the line "High School List".
I have this much, but then don't know how to read fromt he ComboBox. Not what is highlighted, but the full contents.
FrmPrint.Show()
FrmPrint.LstPrint.Items.Add("High School List")
I am using Visual Basic 2010 Express. I have 2 forms. A main form which does all the grunt work and then a small supporting form to get some additional user inputs.
Some program background...I am developing a program to characterize solid rocket motors based on test stand data for a hobby project. I load the time, thrust data into lists via a streamreader from a text box.
However, since the data is raw I would like for the user to select the "start" and "end" of the burn. I am currently trying to do it right after I load the data. As I read the data in, I just put it in the listbox of the supporting form as well. My main issue is, I need two values from the user. A start and end time. the index would probably be easiest, as I will rewrite the data list based on the time increment and delete everything before the first listbox selection and everything after the second selection. I can't get the values from the main form. I have exhaustively searched the internet trying to find something that I can apply. If someone could help with a framework on how to do this.
I understand how to get text from this text box on a different form, but this deals in variables and maybe setting up a class? I am having trouble communicating between the two forms.
I have a webbrowser I'm making, and my listbox items for form2 disappear once I close form2 and reopen form 2. However, once I restart the program (Close everything) and re-enter, the data is saved. But once I reopen the selected form, the listbox items are lost. Here is my code (It's long)
View 6 Repliesi have two forms, one form is for accepting the details of the customer and other form is to export the customer details to excel. In the second form i have a listbox which contains all the names(rather captions) of the controls on the form1. like Items In Listbox -> Map onto control of Form1 customer Name -> txtcustomerName Address -> TxtAddress. What i want to ask is what is the best way to get the values from the form1 based on the selection(s) of listbox in form2
View 1 RepliesI have some info in a listbox on another form. I want that information parsed to another form, and I would like to, for how ever many items there are in a listbox, create a button for every item and obviously parse the name to another label. I guess I would do this via an array.
View 2 RepliesI am trying to autoselect pre-programmed items in a listbox when a form opens with the control on it.but i cannot find a proper method to select all the items in the listbox and hold the resulting text as a string that will later be saved to a text file. i do not need help with saving the text to file but rather selecting the items in the listbox.so, after alot of trial and error and no luck I think I am supposed to use
ListBox.ObjectCollection
propriety. but i have no clue whats so ever in how to manage to select all the items in the listbox when this form opens...if this does not make sence then I will rephraze it.
So I want it to remove any text in the list box that has a "Job" in it and just replace it with a blank nothing.
Like if the listbox looked like this
Yardjob
jobsong
redjob
then it would change it to this
Yard
song
red
I also would like a way of removing any blank items from the listbox.
[URL]
I am currently working on a project that has a splashscreen This splash screen is designed to be shown when the main form begins to load its requirements, and then closes once it has loaded... Currently it works like so:
Private Sub frmMain_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
frmSplash.Show()
dolotsofloading()
frmSplash.Close()
End Sub
[Code]...
I am using the below code to find all the items in a listbox using vb.net 2005. But how can remove the non searched items from the listbox after searching?
[Code]...
I am trying to remove items from a listbox based on the items on another listbox, this seems simple but apparently[code]...
View 1 RepliesI've got a checked listbox on my form which saves the checked items to a spot in my database on the .ItemCheck event.But there's a problem, when I begin checking items, I check the box and click off it, but it doesn't save. (This is if I've only chosen one item)
If I choose two or more items it will save, but unchecking them takes a lot of clicking around to figure it out.Is there a better event that I can use? I've tried the SelectedIndexChanged and that has the same result, there's a lot of clicking around in the checkboxes to end up with the desired selected items, and it does not allow a single item.
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.
[Code]...
I have a multiple form application with a listbox on each form. I want to be able to select an item in one listbox on one form and then click a button and it show up in a listbox on another form.
View 3 RepliesI'm making an application that does some stuff involving the given subject, so this is very crucial to the completion and efficiency of my application.What I'm in need of today is simple (well, "seems" simple). I have one listbox that I want to populate with directories file's names. I don't mean the files inside the directories, but the names of the folders inside the directory.So, I have "c:empdog", I'd click on my button or whatever and search for the directory and I choose "temp", said listbox would show "dog".
UPDATE: Oh, BTW. It doesn't HAVE to be a listbox, it can be anything (IE: Textbox, Labels, Etc.).
For some reason, the following code is causing me some issues. This code pulls lockout status data from AD and contains the data within a datatable. An event is raised from the threaded procedure to add the data to a listview control. For some reason one row of data gets added to the listview control and when you run the procedure gain, 2 rows of the same data gets added, and then 3 rows, etc.
This code calls the procedure "CallGetUserLockout"
GetLockoutStatusToolStripMenuItem.DropDownItems.Add("For Current User - " & User, Nothing, AddressOf CallGetUserLockout)
[code].....
I currently have a form with a listview. On another form, I would like get all the items from that listview. This I can achieve but I always get the "Cross-Thread operation not allowed exception" message. I've tried the following code to avail.
[Code]...
I'm trying to add items to a listbox from another thread, but am not getting any. [Code] I've verified that inside the FOR loop, in the UpdateUI method, DOES have the correct values, they just aren't being added. What am I doing wrong here?
View 10 RepliesI have a small program that checks webpages for certain strings. I am using VB express 2010 .net version 4.I have the list of URLs in a listview, and loop through all the urls, perform a webrequest, check if the source contains certain strings and then add a subitem to the current listview with text to indicate the result I am attempting to speed the application up using a parallel.for loop, but this causes a cross threading exception.This is the code for single threaded:
For i As Integer = 0 to lvUrls.Items.Count - 1
Dim lv As ListViewItem = lvUrls.Items(i)
lv.UseItemStyleForSubItems = False
[code]....
I have the following sub:Private Sub AmIintheListBox1(ByVal datatoenter As String)'Note.- ListboxItemsCount is a variable in the listbox1 change event
[Code]...
I do not know how to do the search of the datatoenter in a listbox with more then one item. If the item is already in the listbox then exit otherwise add it to the listbox.Threaddisplay adds the data to the listbox which I can do when there is no item yet.
I've been trying to add to a listbox item from a different thread (thread 2) than the thread in which the form/listbox was created (thread 1).
When I check ListBoxItem.InvokeRequired from within thread 2 it is always false when ApartmentState.STA is set. When set to MTA I get an error. Thread 2 is a unique thread with different ID from thread 1.
What is frustrating is that at one point it was working fine, and then I changed some of the structure of the project and it has now stopped working (and I don't know which change caused this! It was a while ago).
This code is within a form class:
Option Strict Off
Option Explicit On
Imports System.Threading
Friend Class MainWinForm
[Code]....
I want to write code that complete task of putting 0 to 1000 via thread in listbox. I want to start 10 threads at startup and complete task.
All threads should work equally. Each thread will write 100 numbers. First start from 0 to 100, second from 100 to 200, third from 200 to 300, so on upto 10th.
I have written code but it has problem.
Dim num As Int16
Dim startLoop As Int16
Dim endLoop As Int16
[CODE]...
this is going to be hard to explain but ill try. Question 1. Ok i have a list box with a few items, What i want for this example is to click a button and it will start on the first item and do: MsgBox ("this is item blah blah blah") then after that it will go to the next item and do the same and then the next and so on untill all have been done. The "blah blah" should be the item so if item was to say "hello" then the msgbox would say "this item is hello" I know this would be a lot of msgboxes to close, like if 50 items then thats 50 msgboxes to close, this is just for the example.
Question 2. Ok this is where ive tryed to learn but find it really hard (multithreading) Im wanting all to be multithreaded so all work at the same time, ive tryed a few times but the only way i see it is having a **** load of subs, like if i want it to use 10 threads then ill have to add the same code 10 times or somet, im not sure.
i have attempted all this and failed big time as my way was to get the first item and use that then remove it from the listbox BUT... with it being quite fast the 2nd 1 and 3rd 1 used the same item befor it was removed and to be honest i dont really want them removed. so my attempts took like 2-3 days that was a waste of time really. I Know this is a lot to ask but im in real need of it and these 2 things have driven me half mad.
my homework question is to display the selected items from a listbox (multi-extended) in a label. I need to display all the selected names in a label. the simplest most uncluttered way of doing this. This is what I've got but it doesn't work.
[Code]...
Why is this code having the opposite effect? If It's checked in the checkedlistbox it's not check in my view, if it's not check in my checkedlistbox it is checked in the grid.
EDIT: More specifically. The CheckState.Checked is always the opposite. .Checked means it's not checked.
Private Sub CheckedListBox1_ItemCheck(ByVal sender As Object, ByVal e As System.Windows.Forms.ItemCheckEventArgs) Handles CheckedListBox1.ItemCheck
Try
[Code]....
In one application, I need use 4 simultaneous threads.When the threads finished, I need to update the text of a TextBox.So, I create 4 Textbox, and I wanna the threads change the text to FINISHED.Each thread change one distinct TB.I use this "example"
Dim Terminados As Integer = 0
Private Sub frmEnviarMensagem_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Timer1.Enabled = True
Timer1.Start()
[code]....
The problem is, I have an error in the red lines.The error is: INVALIDOPERATIONEXCEPTION "Cross-Thread operation not valid: Control tbPlaca1 Accessed from a thread other than the thread it was created on."I don't use cross threading. Each TB only was accessed for the correspondent thread, and for the "main program".
This is the error message I am getting:
"Cross-thread operation not valid: Control 'Panel1' accessed from a thread other than the thread it was created on." The reason I am getting this error is because I am opening up a new form and then calling these three things:
Panel1.Show()
Label1.Show()
Label2.Show()
why I get this error message because it doesn't occur normally if I open Form2 after closing Form1, it only occurs when I open Form2 after closing Form4.