Forms :: Looping Through Listbox Making Calculation To Every Item - Won't Update New Result
Apr 6, 2009
i have 2 list boxes.. Qty and Cost both of these are populated from a sql database. The code is suppose to read through the listboxes and multiple the Cost by the Qty and then replace the Cost with the new result. The Cost listbox is populated with the cost of one item. The reason i am not doing this calculation in the sql query is because the sql query is very complicated filter out a bunch of stuff to show just the qty of the item...
[Code]...
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Feb 17, 2009
how can i automatically update my value when a user changs the listbox item. At the moment i have a button click when the user changes the list box item and press the button the values get updated, everytime the listbox item get changed i have to repeat it click the button to update the value. I want something where automitically as soon as the listbox item selected the total value in the text box to change without clicking the button:
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
If ComboBox1.SelectedItem = "Seafood" Then
TextBox1.Text = 3.5 * ComboBox2.SelectedItem
[code]....
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Mar 24, 2010
I need to find a method of looping through a listbox and retrieving the index number and values - quite straightforward in asp, but turning out to be something of a nightmare in winforms!Here is the scenario - The user can add values in a textbox, that are in turn added to a DataTable that gives it a unique ID and a row number, this is then bound to the listbox. The user can then move the items up or down the list by adjusting the row number in the datatable and rebinding to the listbox..
The problem that I am hitting is when the user needs to delete an item -the first part is easy - delete from the DataTable and rebind to the listbox. The bit where I hit the proverbial brick wall is needing to loop through the listbox rows and getting both the index number and the ValueMember - that way I can change the row numbers in the DataTable based on the index number against the ID number.
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Aug 27, 2011
i have a listbox which can be updated. and another listbox with some denominations concerning the first listbox. i am populating the listbox directly from the database. each item in the first listbox have many denominations given in the second listbox. the problem is when i add new items into the database, the items of the first listbox repeats. so in ma updated listbox, the items get repeated. how can i avoid this repetition.
[Code]...
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Jul 3, 2009
On my form is a listbox. When the user clicks insert (in the menu) then I add a blank item in the listbox. The user then enters the data and then I want to update my listbox with the value(s) the user entered. The problem is that I don't see the update in the listbox, unless I reload it from the database. [Code]
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Mar 15, 2009
I've been pondering upon my idea on how to create/update a text file using each item in a listbox as lines, but I fail each time. I've searched this forum as well as my friend, Google. Still nothing.
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May 12, 2009
i'm doing a desktop application using VS2005 with MSSQL 2005. i have a problem with the where clause in the update statement while selecting the listbox item. this is the code for the listbox in load page:
[Code]....
and this is my update query in the delete button event handler: mySQL = "update Appointment set recordStatus = 'deleted'" how do i put in the where clause in when i have 4 columns in the listbox? so can i do this with listbox or have to do with datagridview?
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Apr 14, 2009
How do you display your result of a calculation in a message box?
Code
MsgBox("Average = " & textbox1 & "" + vbInformation + vbOKOnly)
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Jun 6, 2011
I trying to make a code to Delete and Update Access 2007 database after remove a selected item from a listbox in VB 2008. [using "Remove" button that i create] pervious i already make a button to View data from database and Remove from listbox. but i don't know how to delete and update in database.
The code i using now:
CODE:
In the database, i have ID,Name and Age (simple database)
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Jul 26, 2010
I have a listbox that contains several items (the amount of items changes depending on who is using the application). The listbox is setup so the user can select more then one item. I am attempting to submit the user selection(s) to the database. The problem I'm having is that when I loop through the array to find out what is selected, I'm only getting the first item selected (because I cannot deselect it).
[Code]...
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May 18, 2012
I've a very simple situation, which of course I can overcome with logic, but is there a built in VB function to ensure the following:
Dim price
Dim subsidy
if price - subsidy <= 0 then
price = 0
end if
In practical terms, I've lots of other things going on to calculate price, so I want to simplify this to:
Dim price = calculatedPrice - subsidy
and wrap that into some VB formating that ensures if price ever becomes negative it's forced to zero.
I'm thinking that a simple "Type" conversion might do it, but am not sure which type would suit.
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Oct 14, 2011
I got a problem with my calculation .The problem is after addition and subtraction calculation I only get result or answer 0, .There are not a correct answer. I try to change the datatype of the variable to decimal and double but answer is still 0.
Here is my coding.
Private Sub btnadditionprice_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnadditionprice.Click
Dim sum6, sum9 As Decimal
sum6 = Val(Me.ItemPriceTextBox.Text) + Val(Me.txtadditionprice.Text)
[Code] .....
Answer which got is 0.000
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Jan 17, 2010
i have three text boxes that the user will input numerical data into to determine the area of an object. i need the result of my calculation to be displayed in a label but i cant figure it out.
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Apr 24, 2011
How do i make a ListBox with the addition of each item, the item be removed after 4 seconds? Added time and number of items is unknown. Other parts of the job application should not be hampered. I know that thread should I use, but I do not know.
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May 20, 2011
im having trouble with moving listbox items between several listboxes with the click of a button?
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Apr 22, 2009
Im trying to remove a certain bit of text from my listbox item..
heres my code..
If ListBox1.Text.Contains(".zip") Then
ListBox1.Text = ListBox1.Text.Remove(".zip")
End If
and when i start it and it tries to remove it, it comes up with an error saying
Conversion from string ".zip" to type 'Integer' is not valid.
ive tried, this code..
If ListBox1.Text.Contains(".zip") Then
ListBox1.Text.Remove(".zip")
End If
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Jun 25, 2011
how compare the selected item of the listbox with the database and dispaly data again in the textbox of front end
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Sep 12, 2010
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How can I count the number of items in my listbox. Here is my codes:
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
myListbox.Items.Add(txtText.Text & "")
End Sub
Private Sub Form2_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
txtTextListCount.Text = myListbox.Items.Count
End Sub
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Jun 9, 2009
I tried to add icons to the items in the listbox(owner drawn listbox- variable). I m able to do it. But after adding the items, according to my requirement i need to remove few items now and then.I used:Listbox1.Items.Remove("Aqua")This removes the last item from the listbox instead of the mentioned one. the same is done even if i try to remove the selected index item.
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Aug 13, 2011
I'm trying to make an aplication in wich you'll use the textbox to select an item form the listbox If the listbox has:
[Code]...
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Nov 29, 2010
I have a form called 'Bookmarks' that loads a bookmark file that contains a single word on one line. I have put buttons on the form for sorting this list, deleting items and changing the character case to lowercase, uppercase or Sentence Case.Now, deleting and sorting the list works fine, but when I try to change character cases,nothing happens. I started the debugger and found that my case changing code does work, but the listbox doesn't seem to update it's contents.I tried listbox.Update() and listbox.Refresh() but that didn't work either.
Here's my code for 'Set Case':
Private Sub setCase_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles setCase.Click
If bookCase = "default" Then Exit Sub
If bookCase = "lower" Then
[code]....
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Jan 4, 2011
I have inherited from a Windows.Forms.Listbox so I could override the OnPaint and OnDrawItem methods in an effort to highlight specific items and alternate backcolors. I am also skipping some DrawItem events to prevent flickering.Everything is working fine, however when I select items in the listbox, it looks like the font is shrinking or becoming more compressed.Then when I mouse leave, the font goes back to its normal size and appearance but the same items are still selected (which is correct). During debugging the font never changes nor do any of its properties, but it does end up looking different when the item is selected and the mousedown event just happened.
Public Sub New(ByVal relativityHighlightColor As System.Drawing.Color)
_relativityHighlightColor = relativityHighlightColor
Me.SetStyle( _
System.Windows.Forms.ControlStyles.OptimizedDoubleBuffer Or System.Windows.Forms.ControlStyles.ResizeRedraw Or
[code]....
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Jul 5, 2010
In my application I have a listbox and SelectionMode should be MultiSimple because users need to see which items they selected. In another tab we have another listbox this one should show all the selection users had done in first tab. Private Sub
[Code]....
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Mar 23, 2012
i'm trying to make a simple email sender and the problem is that during the sending process my application freezes, therefore my progress bar also freezes so is there anyway i can try to make application not to freeze?
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Mar 12, 2012
I am struggling to write the code for a calculation. The calculation I wish to do is to multiply the quantity of an item by the price. The problem is that the "form" i am creating uses a letter (i.e A, B, C etc) which corresponds to a set value. I do not know how to link the Letter to the corresponding value.
For Example, A= 25, B= 20, C=25
I want to calculate the total of 6 lots of A. I am also using a Combo Box to list the Letters.
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Jan 21, 2012
Is it possible to compare 2 dataitems and then display the result depending on the 2 values using if eval at run time?I have a ListView with databound controls. 1 is RedemptionChoice and the 2 is CashBack.When 1 reads "0" and 2 reads > 0.00 the output should read AUTO I have read many comments online and most point to create a new function within code behind but have found it impossible to implement on my own.I tried this as a test on the actual page:
<%# If(Eval("CashBackRedemptionChoice").Equals("0") & Eval("[CashBack]").Equals("0.00"), "Auto Cashback"))%>
2 needs to be greater than 0.00 for AUTO to be displayed. Hence I know this would not work. Just trying to give an example of what I would like.
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Sep 14, 2010
I need to be able to display 60 * x. X is going to be the time between hitting a Stat button and a Stop button in seconds. I need this to be shown until it is stopped. So i was thinking something like txtBox1.text = 60*time, but I do not know if that is correct and I do not know how to get that time. Also I am not sure how to continuously update the text box.
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Jan 19, 2010
I have a listbox with SelectionMode = MultiExtended. I am trying to capture all the selected values to end up with 1 variable that includes all the selections in the listbox.I'm getting error "Public member 'Selected' on type 'String' not found." at the start of my If statement
Code:
For iLoop = 0 To Me.lstVDN.Items.Count - 1
If Me.lstVDN.Items(iLoop).Selected Then
VDN = VDN & Mid(Me.lstVDN.Items(iLoop).Value, 1, 5) & "','"
End If
Next
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Jul 13, 2010
Clipboard.SetText(ListBox1.SelectedItem.ToString)to copy the selected item, is there a way loop the listbox and copy the entire text? im assuming i would have to loop the listbox to a textbox first them jus
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Feb 25, 2011
At the moment I have a listbox and two buttons. The first button will add files from a directory to the listbox, whilst my second button processes a single txt file inside a folder to remove certain words, then save the processed document as a copy.
Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
' Replace common words and all symbols.
Dim wordsToReplace() As String = {" cat ", " hat ", " that ", ", ", ". "}
Using sr As System.IO.StreamReader = New System.IO.StreamReader("C:User est.txt")
' Read the entire file into memory.
[Code] .....
What I am trying to do now, is rather than process documents in a static folder, I want to process the documents that are inside my listbox, and save the new copies back to the list box (repopulate the list box with the processed txt files, I hope that makes sense). What I think I need to do is loop through the listbox and take the file path for each item, process it, then feed these back into my listbox.
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