Forms Data Controls :: Looping Through A Listbox?

May 11, 2010

I have a ListView which has Product Code,Desc, ColorCode, Size and Quantity as the columns as well as a checkbox

The listbox sits within a panel.

The user enters the quantity and checks the item(s) they wish to purchase. They accept their selection by clicking a button the sit within the ItemView

Once they have made their order and clicked the button I want to make the panel disappear and display the items on the page.

how to iterate through the Listview and how to grab the items and close the panel

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How To Get All The Values In A Listbox When Looping Through Them

Jan 11, 2010

I'm currently trying to move through all the values added to a listbox by the user, however, I want to retrieve the actual value of each item in the listbox and not the text.

I've gotten so far with the code below, but that only gets the text and not the value.


How would I go about getting the value for each item in the collection?

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Forms Data Controls :: ListBox, Array List / Update The Listbox Content?

Mar 26, 2011

I am designing a program that will let me enter the name of an item to swap and adds the swap to an array list when a button Add is pressed. Once the item is added to the array list a Sub Procedure should be called which displays the contents of the array list in a list box.

The system will also allow me to remove items from the array list using a Remove button

followed by updating array list.

I have done some part which puts item into the listbox1 which i named lstSwapList.I would need some assistance on the Sub Procedure to display the Value or Description on the other listbox2 which i have also named lstContent,if a value is selected from the listbox1.

I would also want to know how to update the Listbox content,However i hv added a sample of the way i guess it may be.

Any complete solution from anybody on the Sub Procedure and the Update Swap procedure will be greately appreciated.

The script below is what i have done so far.

Partial Class _Default
Inherits System.Web.UI.Page
Protected Sub lstContent_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles lstContent.SelectedIndexChanged
End Sub
Protected Sub lstSwapList_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles lstSwapList.SelectedIndexChanged
End Sub
Protected Sub btnAddSwap_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnAddSwap.Click
Dim SwapValue As String = "Sixty Pounds"
Dim Counter As Integer = 8
Dim SwapN0 As Integer
lstSwapList.Items.Add(New ListItem("300", "1"))
lstSwapList.Items.Add(New ListItem("ASP.Net", "2"))
lstSwapList.Items.Add(New ListItem("Programming", "3"))
SwapN0 = lstSwapList.SelectedValue
For Counter = 0 To -1
SwapN0 = lstContent.Items.Count
End Sub
Protected Sub btnDeleteSwap_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnDeleteSwap.Click
End Sub
Protected Sub btnUpdateSwap_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnUpdateSwap.Click
End Sub
End Class

Sub UpdateSwap(ByVal valueA As String, ByVal ValueBAs String, ByVal ValueC As Integer, ByVal ValueD As Date)

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Here is the code.


What happens is it exports only the first checked box to excel and then stops.

What am I doing wrong? I need to export all the checked checkboxes to separate excel files.

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May 9, 2010

I am trying to add the checked rows into the database by looping through but im getting this error:

Object reference not set to an instance of an object.


An unhandled exception occurred during the execution of the current web request. review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.

Source Error:


Heres my add click event:


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I have two gridview. The first gridview with checkbox and if i check the checkbox in first grid that particular row will be binded to second grid. In second grid i have a textbox and dropdown. Have enabled pagination in both grids. When i check the checkbox in first grid i loop through all records in second grid to bind the previous values. Problem is since i have enabled pagination gridview row count only retuns current page row count. How to loop through all rows?.

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Something like:

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name ____


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name address class selected

name address class selected

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name address class selected

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Multi-Select (CodeBehind):




DetailsView (CodeBehind):


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