how to Add 3 listboxes items into one listbox

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Hello
I have 3 listboxes each one contains many items (listbox1 , listbox2,listbox3)
and another empty listbox (listbox4)
im trying to add first three listboxes items into the 4th listbox

ex: ) listbox1 first items is 'A' , listbox2 first items is 'b' , listbox3 first items is 'c'
now listbox4 first item must be "Abc"

The problem is Its work but keep loop the items.

here is my code :

VB

For i = 1 To ListBox1.Items.Count - 1

           For j = i To ListBox2.Items.Count - 1

               For k = j To ListBox3.Items.Count - 1

                   ListBox4.Items.Add(ListBox1.Items(j).ToString + ListBox2.Items(j).ToString + ListBox3.Items(k).ToString)

                   Exit For
               Next
           Next
       Next

Posted 15-Dec-15 2:13am

Member 12208071

Updated 15-Dec-15 2:37am

v3

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Rajdeep Debnath 15-Dec-15 8:21am

listbox1, listbox2, listbox3 have same no of items?

Leo Chapiro 15-Dec-15 8:28am

And what is your problem, have you got an error? Further if you want to add only the FIRST ITEMS so you don't need any loop.

Member 12208071 15-Dec-15 8:35am

I need all the items not just the first , the problem is items keep looping inside the listbox4

Leo Chapiro 15-Dec-15 9:05am

What does it mean: items keep looping inside the listbox4? What is the result of adding the items?

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CHill60 · Answer 1 · 2015-12-15T06:18:00

An alternative using Linq

C#

Dim l1 As List(Of String) = ListBox1.Items.Cast(Of String)().ToList()
Dim l2 As List(Of String) = ListBox2.Items.Cast(Of String)().ToList()
Dim l3 As List(Of String) = ListBox3.Items.Cast(Of String)().ToList()

Dim l4 As List(Of String) = New List(Of String)(l1)
l4.AddRange(l2)
l4.AddRange(l3)

ListBox4.DataSource = l4

bojammis · Answer 2 · 2015-12-15T05:58:00

Your code might work if all the list boxes had equal number of items. Consider this approach:

VB.NET

Dim list As New List(Of ListBox)
list.AddRange({ListBox1, ListBox2, ListBox3})
For Each l As ListBox In list
    For Each s As String In l.Items
        ListBox4.Items.Add(s)
    Next
Next

Hope this helps.

regs

how to Add 3 listboxes items into one listbox

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