Is there a way to to combine line's 1 and 2? I only want to loop through a list of the selected items in this listbox. This works just fine, I just wondered if there was a collection of selected values returned that I could use to avoid having to do it this way.
For Loop1 = 0 To MyListBox.Items.Count - 1
If MyListBox.Items(Loop1).Selected = True Then
...
End
Next
how to loop through DGV selected rows collection?
View 2 RepliesI want to retrieve the selected items in a listbox, save them to a collection, and then use that collection later. I thought that was simple enough, but when I clear the selected items in the listbox, my collections (items, indices) change. I found this out by stepping through the code.
Basically what I'm wanting to do is move items in the listbox up or down (up in this case), and still keep them selected.
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I have a quick question...is it possible to make a "for... each" loop that would go through each selected item of a listbox? What I want to do make sure there are no dupe names in the listbox.
View 2 RepliesI am binding my listbox to a dataTable, the reason why i am using a listbox is for multiple selection, the user can select more that 1 item, when the user has selected there items, i need to save them into the db, line after line. heres my code, i cannot get the listbox to display all the selected items in my test page.for now in my test page, i just want to show the selected indexes of the items, and then in my next step i would want to add then indexes to the database, for now i just want to loop and display all the selected indexes.
Protected Sub Page_Init(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Init
'1. Create a connection
Dim conn As New MySqlConnection(ConfigurationManager.ConnectionStrings("MyConn").ConnectionString)
Try
[code]....
remove selected items from a listbox using a for each loop?
View 5 RepliesI have a little problem. Basicly, I have a ListBox, TrackBar, TextBox and 2 Buttons. What I want now is that:
1. If user clicks on Button1, the program will add text from TextBox to ListBox (I know code for that one).
2. When user clicks on ListBox item, ListBox item selected, and then clicks on Button2, program will set the value of SelectedItem to TrackBar. Here's an example:
User writes "Value is 50." in TextBox, clicks on Button1 and program adds "Value is 50." to ListBox. Now user selects ListBoxItem and clicks on Button2. Program sets TrackBar value to 50.
Im having a problem getting the selected values of a listbox that is data-bound..
vb.net
Do Until CType(Ctrl, ListBox).SelectedIndices.Count = 0
For Each Index In CType(Ctrl, ListBox).SelectedIndices
[code]....
The error message says... "Operator '&' is not defined for type 'DataRowView' and string " "." And the only way I can get it to work is to pull out the & operator and change that line of code to this.
vb.net
'FROM THIS:
TableData.Miscellaneous += CType(Ctrl, ListBox).SelectedValue & " " 'Errors HERE
[code]....
The SelectedItem text shows up in the controls current state while debugging, correctly.. but after I finish the execution it shows up as "System.Data.DataRowView"?
I have items in a listbox control that I would like to repeatedly (when it gets to the last one, repeat) loop through and set the text to a label.
View 2 RepliesI'm trying to create a for loop that will display the values (favorite programming languages) a user selects for a listbox.
So far I have this:
Dim selectedLanguages As String = ""
For intLoopIndex As Integer = 0 To languageListBox.Items.Count - 1
[code]....
So far, no matter how many items they select it will display a comma even if only one item is selected, example "C#,"However this is what I need it to do:
1. If the user selects one programming language than it should just printout the selected course with a period right after it. Example: C#.
2. If the user selects two languages it needs to have the text "and" between them followed by a period. Example: VisualBasic.Net and C#.
3. If the user selects three or more languages it needs to seperate them like this for example (again with a period at the end): VisualBasic.Net, C#, and Asp.net.
This is my code which i used to try this but it inserts only the last value in the listbox but i need all the selected values seperated by comma [code]...
View 2 RepliesI have a simple Dictionary(of String, Object) that I need to iterate through and change items depending on some conditions.As I can't modify a collection that I'm iterating through, how do I achieve this?For example, the following obviously causes an Invalid Operation Exception:
Dim mOptions As New Dictionary(of String, Object)
mOptions.Add("optA", "A")
mOptions.Add("optB", "B")
mOptions.Add("optC", "C")
[code]....
Im trying to loop through a collection of controls see code:
Private Sub addZeros()
For Each ctrl As Control In Me.Controls
If TypeOf ctrl Is GroupBox Then
[Code]....
In an application I am working on I have created a product class which represents an inventory item. I have also created an inventory class which represents a collection of product objects. In the constructor of the Inventory class I load 4 products into a product collection. Each product consists of a code, description price and quantity.
[Code]...
I'm trying to just iterate through this xml and grab all of its data and add it to my collection(_personOC). Right now it's not working. How can I do this without having to specify the id? All I did was make a dataset with a person table and saved it as a xml.
Public Property personOC As ObservableCollection(Of Person)
Get
Return _personOC
[Code]....
I decided to go back to the VB6 book, "Learn to Program Visual Basic Objects", so I can code it in VB2010. This has been a great learning experience. However I've run into a problem. I'm getting an error with a For....Each loop for a collection class. The error message states, Expression is of type 'China.Order', which is not a collection type." From what I've deduced the problem deals with an enumerator. I could be wrong.
View 2 RepliesI'm trying to loop through a collection object in vb2010.The code was originally used in Vb6 The book said that I needed to code a NewEnumerator method first in order to be able to loop through my collection. I coded the following:
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It gives an error for IUnknown, staging that IUnknown is not accessible in this context because it is a 'Friend'.In the line in the function I removed the Set since it's no longer needed.The error message for this line is '_NewEnum' is not a member of 'Microsoft.VisualBasic.Collection'What are these messages and how do I fix this in VB 2010?m_colCourse is not a system collection.
I have a Collection, the keys are strings and the values are Collections. In the sub Collections the keys are strings and values are Singles/Floats. How would I loop through all of the data? I need to get the keys and values not just the values. I've tried this but it produces a cast error:
[Code]...
CAUTION: Noob using Win32 API ahead
I want to display a list of open windows on my computer in a rich text box. So, I'm trying to store the names of all windows in myString, and then set RichTextBox1.Text = myString.
Here's the code
Imports System
Imports System.Collections.Generic
Imports System.Collections.ObjectModel
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I am trying to use a Web Service to return Json for a Collection of Users from a Database Table. I'm only new to .NET (< 1 week experience), and I don't want to use the UpdatePanel for AJAX. I have tried using the JavaScriptSerializer as well as Json.NET to serialize. Both cases seem to spawn an Infinite Loop.[code]
View 1 RepliesI often use a for/next loop to cycle through a collection to find a particular member of that collection based on some criteria. This works fine in every case except one: when I want to then erase the very member of the collection I just found. For example, if I wanted to give the heave-ho to every obect in a collection class that has a member veriable Color equal to Red:
[Code]...
The problem is once the collection class member is erased it makes to loop invalid because taking out the member reduces the total count of the collection in the middle of the loop. Eventually I get a "Index is out of range" error.This circumstance has bothered me every so often; I bet more experienced programmers have a different type of loop system that works better than this when you want to erase a collection member.
This is weird. I have a class that inherits from IEnumrable whose Count property is reporting 0 (zero) elements but the For Each loop steps into the loop body and tries to use the variable where it should just be moving on. My code:
On Error Resume Next
Dim d As Foo
For Each d In fooCollection
' use d and throws an exception
Next d
Weirder still, every time d is accessed i get an exception thrown in the output window:
A first chance exception of type 'System.NullReferenceException'
but i'm not stopping on the exception (not in a try/catch block).Is "On Error Resume Next" causing this weirdness?
Weirdness found:Per Rowland's and JohnH's comments i checked the Foo class:The GetEnumerator method inside of Foo didn't actually return anything! It had an empty body. That coupled with the On Error Resume Next before the loop caused the havoc! Wow this was ugly.
I would like to be able to save to a db and send task to email or as text msg for instance nevermind that.. I have two variables of type ArrayList they are "_mList1" , "_mList2" and "_mList3"
_mList1 stores the list of Telephonenumbers , _mList2 stores the list of StaffIDs and _mList3 Some concatenated string.
theses variable lists will hold some data in runtime as explained and i would like to use them to populate a DB table again mentioned
tblTask (TaskID(PK), Action, StaffID(FK), AssignedBy, TelephoneContacted, NotesCotent)
tblStaff (StaffID(PK), FirstName, Surname, Telephone, Address etc..)
[Code]....
I am trying to make a collection of controls that I can loop through. So I have this code in my form... Dim WizardFrameCollection As New Control.ControlCollection(Nothing)
I then try to add controls to the collection by I get a error "Object reference not set to an instance of an object." WizardFrameCollection.Add(Me.GroupBox1) I am not sure why I am getting this error. Groupbox1 is a groupbox that is on the form.
I am encountering an error when looping through datarows. I searched SO and tried the solutions, but no luck. Collection was modified; enumeration operation might not execute.
Dim dRow As DataRow
For Each dRow In dt.Rows
dt.Rows.Add(dRow("CustNum"), dRow("SalesRepName"), dRow("mgrid"), "=""" & dRow("midValue") & """", dRow("dba"), dRow("sysDate"), dRow("statusID"))
Next
The error occurs the first time the code hits "Next". What would be causing Collection was modified; enumeration operation might not execute.How can I resolve this error?
I have a class with a collection of objects of type clsCDImage
clsAllCDs:
Imports System.Data.OleDb
Public Class clsImages
Private mAllCDimages As New Collection
[Code].....
I am trying to add numbers. So if there are 2 numbers in a listbox, theyare summed up. If there are 3 numbers in a listbox, they are summed up
[Code]...
What I'm trying to do is to count the number of items. Then I start my counter at 0. For each time the counter goes up, I add another row from the list box. and loops until my counter reaches the number of items in my listbox. I'm stuck intTotal. The only way I know of adding the totals is lstCosts.Items(0)+lstCosts.Items(1)+lstCosts.Items(3). But what if the user enters 4 numbers? I can't find a way around that. I think this should be a very simple question and I think only this line needs to be changed.
i have a string = "/a/value1/x/valueforx/b/value2/c/value3"
the keys a, b, and c can be in any order in the string that is coming in and will always be separated by a slash.
What i need to do is to find a, b, c and then add their values to a collection
I'm in the process of creating my own version of the Combo Box as MS version does not give me the flexibility I need, this is work fine. I just had a little niggle
The List box contains/uses ObjectCollection to hold all its objects, but it does not have the facility to inform by the way of events that an item has been added etc.
If I inherited from this collection could I add the necessary code to make this happen, I have done this in my previous controls I�ve created when I wanted this facility.
I am creating a glossary of words used in a study course. I would like to populate listbox with words entered into an imputbox.
View 8 Replies