Private Function isValidate(ByRef aTextBox As TextBox) As Boolean Dim bResult As

Question

Private Function isValidate(ByRef aTextBox As TextBox) As Boolean
Dim bResult As Boolean

'check all scores entered by the user to make sure that each score is a valid integer from 0 to 100.
Return bResult
End Function

Private Sub btnUpdate_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnUpdate.Click
'check if the user select any item
'call isvalidate function to validate the input
'call update
'call refreshListbox

End Sub

Private Sub clearList(ByRef aList As List(Of Decimal))
'clear list


End Sub
Private Sub refreshListbox(ByRef aListbox As ListBox, ByRef aList As List(Of Decimal))
'call clearListBox //// remove this line
'bound to listbox
aListbox.DataSource = Nothing 'What is the purpose of this statement?
aListbox.DataSource = aList 'Do you know any other objects can be used as the datasouce of listbox?

' aListbox.Refresh()

Explanation / Answer

        Dim index As Integer = lstScores.SelectedIndex

        'removing item at selected index

        lstScores.Items.RemoveAt(index)

        'inserting new item

        lstScores.Items.Insert(index, txtScore.Text)

        lblAverage.Text = "Average :" 'resetting label text

        txtScore.Focus() 'focusing cursor in text box

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