Simple listbox problem

hi... I have just started VB.net and tried to find online for solutions to my problem but I couldn't understand......

say if I have a list box called ListBox1

how do I actually display all data from ListBox1 into a label?

Welcome On the forums :wave:

VB Code:

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        Me.ListBox1.Items.Add("Shakti")
        Me.ListBox1.Items.Add("Singh")
        Me.ListBox1.Items.Add("Dulawat")
    End Sub
 
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim Item As Object
        For Each Item In Me.ListBox1.Items
            Me.Label1.Text = Me.Label1.Text + Item
        Next
    End Sub

This is the just simple example as you want but i suggest use MSDN for learning all the property and use of the DOT net event.
For more detail click on the MSDN at my signature and search there.

Thanks for the guide :thumb:

for the second part of the code

Dim Item As Object
For Each Item In Me.ListBox1.Items
Me.Label1.Text = Me.Label1.Text + Item
Next

is this the only way?

What about

Dim i as Integer
For i =0 To ListBox1.Items.Count - 1
.......
Next

I'm actually wondering what could be put inside the ... I tried
label1.text = ListBox.Items(i)
and a few different type all are not able to work

oh I tried your codings and I have some errors

Operator is not balid for string "" and type 'ListItem'

Exception Details: SYstem.InvalidCastException: Operator is nto balid for string "" and type ListItem ''

inside the listbox I put numbers(int)

Quote:

---

Originally Posted by CarraSome

oh I tried your codings and I have some errors

Operator is not balid for string "" and type 'ListItem'

Exception Details: SYstem.InvalidCastException: Operator is nto balid for string "" and type ListItem ''

inside the listbox I put numbers(int)

---

Hi,

How did you coded, because I've tryed and it's working like it should.
Without any errors.

Wkr,

sparrow1

This is the part of my codes

for adding into the listbox

Dim pet As String
pet = txtPet.Text
Listbox1.Items.Add(pet)

for extracting its

Dim Item As Object
For Each Item In ListBox1.Items
Label1.Text = Label1.Text + Item
Next

Quote:

---

Originally Posted by CarraSome

This is the part of my codes

for adding into the listbox

Dim pet As String
pet = txtPet.Text
Listbox1.Items.Add(pet)

for extracting its

Dim Item As Object
For Each Item In ListBox1.Items
Label1.Text = Label1.Text + Item
Next

---

Hi,

You can try this:

VB Code:

Me.Listbox1.Items.Add(txtPet.Text) ' add item to listbox
 
Dim Item As Object
        For Each Item In Me.ListBox1.Items
           Me.Label1.Text = Me.Label1.Text + Item
        Next

Hope it helps,

sparrow1

what does the Me. actually do?

I'm still having the same error...

has it got to do with the Me. ?

Quote:

---

Originally Posted by CarraSome

what does the Me. actually do?

I'm still having the same error...

has it got to do with the Me. ?

---

Hi,

You can try to create a new testapp with a listbox, label and textbox ans 2 buttons, then use this code. Write something into the textbox and added into the listbox you'll see that it works

VB Code:

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim Item As Object
        For Each Item In Me.ListBox1.Items
            Me.Label1.Text = Me.Label1.Text + Item
           
        Next
    End Sub
 
       Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
        Me.ListBox1.Items.Add(TextBox1.Text)
    End Sub

Wkr,

sparrow1

Quote:

---

Operator is not balid for string "" and type 'ListItem'

Exception Details: SYstem.InvalidCastException: Operator is nto balid for string "" and type ListItem ''

---

The errors are because you are using the "+" operator instead of the string concatenation operator, which you should be using. Also, you are trying to concatenate an object to a string, which you shouldn't do. You should use the "&" character to concatenate, and then use the object's .ToString method in order to get the string representation of the object in the listbox.

VB Code:

'displays each item in the listbox on a new line in a label
For Each Item As Object In ListBox1.Items
       Label1.Text &= Item.ToString & Environment.NewLine
Next