.net - Listbox.selected Index Change Variable Assignment?
Apr 3, 2011
What is the correct way of assigning the selected index's value from a listbox to a variable? The user selects an item in a listbox and then the output changes depending on their selection.
I use:variablename = listbox.text
in the listBox_SelectedIndexChanged event and this works.
When I use the button_click event I use:
variablename = listbox.selectedindex
But this does not work in the listbox_selectedindexchanged event.you let me know if it is okay to use it like I did above or if I will run into problems and why you cannot use the selectedindex method.
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Mar 22, 2012
You wouldn't think so, but it does when the listbox is bound to a datasource (as far as I can see).
I've reduced the behaviour to the code below. The "if" line toggles between loading a list via data binding and loading a list "manually" (both use the same data table). In each case I set the selected index afterwards, and then change the parent form. With manual loading, the selected index is retained, with binding it is lost. I cannot see how this makes any sense - I don't see why changing the host form should alter any property of the list. Is this a bug?
Public Class Form1
Sub main() Handles Me.Load
Dim ListControl1 As ListBox = New ListBox
[Code]....
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Jul 18, 2010
I need a way of converting the listbox.selectedindex into hex and then writing it to a file(The writing is done using PackageIO.writer). The weird thing is the code i use works for most of it but on some of the writes and conversions it just converts the selectedindex to 00 when its not.
Dim Writer As New PackageIO.Writer(Filepath, Endian.Little)
Writer.Position = &HE24A
Writer.WriteUInt16(Convert.ToByte(ListBox3.SelectedIndex))
[code]....
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Oct 10, 2011
I have loaded datatable to listview.Now when i try to do a selected index and retrieve data to display in respective text box. I find some error "input string format incorrect".but when i directly load from folder it works fine.
Data that retrieved from Datatable.Im not able to find the index of the row. But from folder and listed in ListView.Index value is found.
Dim breakfast As ListView.SelectedListViewItemCollection = Me.LOV.SelectedItems
For Each item1 In breakfast
index += Double.Parse(item1.SubItems(1).Text)
Next
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Jan 20, 2010
I am trying to have the index value of a selected item in a combobox returned to a variable. Then, if the variable = 1 (which would be the index of th second item in the combobox), I want a groupbox to be hidden (be invisible) on the form. Here is my code...Getting an error that says:
'ListIndex' is not a member of 'System.Windows.Forms.ComboBox'
Code:
Private Sub cbxAccounts_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs)
Dim selection As Integer = CInt(cbxAccounts.ListIndex)
If selection = 1 Then gbxCheck.Hide()
End Sub
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Jan 20, 2010
I am trying to have the index value of a selected item in a combobox returned to a variable. Then, if the variable = 1 (which would be the index of th second item in the combobox), I want a groupbox to be hidden (be invisible) on the form. Here is my code...Getting an error that says:[code...]
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Jun 7, 2012
First of all, I'm a somewhat-experienced VB3 Developer, and I'm trying to convert a VB3 app to VB.NET.I got the programming guide (http:url....) by searching the web.The problem I'm having is the syntax for .NET is way different than VB3, and that's OK, but finding the correct syntax is very difficult.I'm trying to eliminate duplicates in a ListBox:
When I access the Programing guide, I see that:
ListBox.SelectedIndex Property
Gets or sets the zero-based index of the currently selected item in a ListBox.I also have Murach's and Stephen's manuals, and they say the same thing.Visual Studio converted The old .ListIndex to a VB6 Function:
If VB6.GetItemString(PlayList_ListBox, I) = VB6.GetItemString(PlayList_ListBox, I + 1) Then
This is Try #1. It generates: VB6 is not declared. It may be inaccessible due to its protection level.Then I read that VB6 is only for converting old code.So then I tried SelectedIndex:
Dim I As Short [code]..........
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Mar 1, 2012
Let me try to describe my problems in the simplest way: I have combobox1 and combobox2. I hope to achieve two things: Combox1 is bound to list1 (a list of string). When a user selects an item in list1, list2 (a list of string) will be obtained from database and combobox is bound to list2.If user specifies text1 in combobox1 and text2 in combobox2, then these two values will be shown in the comboboxes regardless of the bound lists.
[Code]...
So the results of above code is that goal 1 is achieved, but goal 2 is never achieved. combobox1.selected index is always 0 and combobox2.selected index is always 0 too.
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Aug 2, 2011
I am working on windows application form I am having one text box and Listbox. I want if user type on textbox, then List box item is going to be selected, that is working fine. List Box has more than 10,000 records. It takes time to select item from ListBox, while write data in textbox.
[Code]...
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Feb 26, 2010
I am inserting the data through textbox of the selected item of the list box I want the when the user will input the data into textbox and then pressing the insert button the the selected item of list box (selected item only color change) color change white into blue or red.
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Apr 7, 2010
How would I go about changing the color of a line of text in a Listbox when the user clicks a button? I have tried using ListBox1.Items(ListBox1.SelectedItem).Forecolor = Color.Gray, but I receive the error "Conversion from string "Mathematics 1" to type 'Integer' is not valid."
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Feb 24, 2009
Is it possible to change the text format of a ListBox selected item at run time?
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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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Oct 24, 2011
I have noticed in VB.Net that most Dim statements also include an assignment. Eg:Dim myvar As String = "Hello World"As this wasn't possible in VB6 I have always done the following:
Dim myvar As String
myvar = "Hello World"
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Sep 24, 2010
I am creating a VB 2008 change calculator as an assignment. The program is to use the amount paid - the amount due to calculate the total.(this is working fine). After that, it is to break that amount down into dollars, quarters, dimes, nickels, and pennies. The problem I am having is that sometimes the quantity of pennies, nickels or dimes will be a negative number. For example $2.99 = 3 Dollars and -1 Pennies.
Option Explicit On
Option Strict Off
Option Infer Off
[code]....
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May 4, 2012
I'm studying VB 2010 at uni and struggling with this assignment, I'm stressing now with one week to go before its time to hand it in and still not knowing how to do it (even though i've read the whole textbook!)
I have copied the instructions and the files I have been given.
1 List all of the data from Teams.txt in a Listbox. Include suitable headings.
2 List all of the data from Results.txt in the Listbox (use the same Listbox as in 1 above). Include suitable headings. Note that you cannot assume that the file contains only results for the first 3 weeks of the season. Your program should be able to process a results file with more or fewer results.
3 List all of the data from Results.txt in the Listbox. However, in this case the actual team names should be output (your program will need to get this data from Teams.txt. The data should be formatted so that it is aligned correctly. Include suitable headings.
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Sep 20, 2011
what it does iswhen a user checks an item in the checked list box it transfer it to a listboxso i have a checked list box and a listboxi am planning to put another listboxwhat i would like to be able to do is thatwhen the user checks an item on the checked list box it will transfer the item into the listbox [like the one on my previous thread]and be able to show an messagebox with a textbox [ i read its called an input box ] or another form with a textbox and/or combo box will pop up
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Dec 9, 2011
I am trying to change an item in a selected item of a listbox.
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Oct 16, 2011
Im just going to have to get used to this language for the rest of the semester And smohd, I will get back to you with my problem. That "Me..." control is so random. Not like JAVA Why am I getting an error with totalGrade
[Code]...
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Dec 22, 2009
E.g. how do I get VB.Net to statically type a local variable to be the static type of the expression on the right had side of the assignment?
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Feb 4, 2012
I'm using Visual Studio 2010 / VB / dot net 4.0, and I have a drop-down menu in my left column that switches resource languages for the end user. It reads like this:
--------English ------- <<- Engish is always the default top language option
French |
Spanish |
[code].....
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Jan 31, 2012
I want to know How to get The last selected Index in the multi select of ListView.For example, when i select Item from index 1 to 10, so I get index 10 as the last selected index.But if i select Item from 10 to 1, so I get index 1 as the last selected index.
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May 3, 2011
how to get the selected index from a listview i know you can do the "ListView.SelectedIndices.Item(0)" but then you still need to know the index of the selected item.
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Dec 9, 2010
'Get the selected index of the list box 'use that selectedindex for the row of the array and get both the quantity and price into local variables in VB
[Code]...
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Oct 19, 2011
Can any one tell me how can i get the current selected indel in the ListView.
I need to execute a code every time the selection changes in ListView.
I have listView with only one column. All the list will be in column 0.
I used the below code in Listview1_Click event and able to get the selected index value,but when i used the same code in the Listview1_SelectedIndexChanged and Listview1_ItemSelectionChanged its giving below below error Private Sub ListView1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles ListView1.Click
[Code]...
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Dec 6, 2011
I think I'm having a brain fart on this but I can't seem to figure out why this is not working.
Public Class Radio_Main
Dim RadioDial As String = 1
Dim Go As String = "http://"
Private Sub pb_Tuner_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles pb_Tuner.Click
'My.Computer.Audio.Stop()
[Code]...
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Jul 22, 2009
I drag Tabcontrol.& add two tab pages. I have contextmenu Strip, dat i bound to tabcontrol.I select the ContextMenuStrip & set it to ContextMenuStrip1
Now i right click on tab headers.Suppose i right click on tabpage1,contextmenu is displayed.I want that when i right click on tabpage..I want to get the index of that tab..Even if dat tab page is selected.[code...]
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Jul 24, 2009
I drag Tabcontrol.& add two tab pages.I have contextmenu Strip, dat i bound to tabcontrol.I select the ContextMenuStrip & set it to ContextMenuStrip1Now i right click on tab headers.Suppose i right click on tabpage1,contextmenu is displayed.I want that when i right click on tabpage..I want to get the index of that tab..Even if dat tab page is selected.Ex-Mozilla.
Private Sub TabControl1_MouseClick(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles TabControl1.MouseClick
Try
[code]....
Above event gives me the index,when i select the tab.
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May 5, 2009
The first would be, how would I go about making each index in a list box an integer or decimal value? For example, If I wanted the 1st (or 0) index to = 300 and the next one (1) = 400. The next question that I have is that, if I had two or more list boxes with each index as a certain value as listed above, how would I go about adding up the total for each index that is selected?
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May 15, 2010
I have a DataGridView containing a large number of columns. I want the users to be able to select multiple columns and then select a menu item to hide the selected columns. For example a user might selected columns 5 through 10 and I want the program to hide those columns. I know how to hide columns, one at a time. I can get the count of selected columns but I have not figured out how to get the index to the left-most selected column. Trial and error is such a slow process.
Considering the huge number of options offered by the DataGridView tool, it would be nice if this forum had a special category for the DataGridView (common to VB and C#).
Finally I got the desired results but it took a lot of coding, looping through the selected cells to find the one with the lowest column index, then a second loop to count previously-hidden columns, then a third loop for hiding the selected columns, stepping past previously-hidden columns and declining to hide frozen columns.
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