How to remove the last item in the list(Of) in vb.net - vb.net

Question

I have a windows form application which added string into list of collection. This can be done by input the string into the textbox then click 'add' button, and the list will display in a listbox.
Now, I want to delete the last item in the list collection & the listbox.
Below are the code snippett that I have done
Public strList As List(Of String) = New List(Of String)
'add string to list
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
If TxtBox.Text <> "" Then
strList.Add(TxtBox.Text)
TxtBox.Clear()
End If
lstItem.Items.Clear()
strList.ForEach(AddressOf ListItem)
End Sub
Private Sub Button2_Click(sender As Object, e As EventArgs) Handles Button2.Click
lstItem.Items.Clear()
strList.ForEach(AddressOf ListItem)
End Sub
'Add item into list
Public Sub ListItem(s As String)
lstItem.Items.Add(s)
'lstItem.Sorted = True
End Sub
Private Sub Button3_Click(sender As Object, e As EventArgs) Handles Button3.Click
strList.ToList.ForEach(AddressOf DeleteItem)
End Sub
'Delete item
Public Sub DeleteItem(s As String)
For i = 0 To strList.Count
lstItem.Items.RemoveAt(strList.Count - 1)
i = i + 1
Next
End Sub
as you can see, in the sub DeleteItem, i try to delete the last item of the list collection by clicking 'delete button'. but the error says Additional information: InvalidArgument=Value of '1' is not valid for 'index'.
can anyone help me on this? thank you.

Answer 1

What you really ought to do is use a BindingList(Of String) and bind it to the ListBox. That way, you only have to deal with one list. Adding and removing against the underlying BindingList will automatically affect the ListBox:
Private items As New BindingList(Of String)
Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
ListBox1.DataSource = items
End Sub
Private Sub addButton_Click(sender As Object, e As EventArgs) Handles addButton.Click
items.Add(TextBox1.Text)
End Sub
Private Sub deleteSelectedButton_Click(sender As Object, e As EventArgs) Handles deleteSelectedButton.Click
items.RemoveAt(ListBox1.SelectedIndex)
End Sub
Private Sub deleteLastButton_Click(sender As Object, e As EventArgs) Handles deleteLastButton.Click
items.RemoveAt(items.Count - 1)
End Sub