Here is my code:

```
    For Each itema In ListBox3.Items
        Dim source As String = getsource(itema)
        If source.Contains("blz blz blz")  Then
            ListBox2.Items.Add(itema & "====> here is one")

        Else
            ListBox2.Items.Add(itema)
        End If

    Next

```

How can I get the result of each item without waiting for the loop of all items in vb.net??
In PHP there is the flush and ob\_flush to flush the memory.