Starting same thread from a foreach loop not working - vb.net

Question

Is there a way to start same Thread form foreach loop
Sub
For Each lvItem As ListViewItem In _ListView.SelectedItems
tThread = New Thread(AddressOf Me.myFunction())
tThread .Start()
Next
End Sub
Sub myFunction()
//Code
End Sub
In my case, when i select one item from list it is working fine...but when i select more than one files it odes not work.

Answer 1

I want to select multiple files (which are file paths) from ListView and convert them in mp3 files but with above solution. it converts first selected file successfully but then stops.
Creating a separate thread for each file is sub-optimal. In some cases, this can actually result in worse performance than doing them all sequentially, because your system will spend too much time switching back and forth between different threads. Instead, you want to choose a small number of threads and queue your items for time by those threads.
There are a lot of ways to implement this:
You can write custom code that bases the number of threads on the number of physical processor cores (greater of 2 or the number of cores - 1 is common). This is a lot of extra work, and is error prone.
You can use the built-in in ThreadPool.QueueUserWorkItem(). This is great, but it can be tricky to track progress of your items.
You can use the Task Parallel Library. This requires .Net 4, but it's probably your best option by far. The extra work upfront learning the concepts will also be a huge payoff, and it sounds like Microsoft is basing some of the more important features in .Net 5 around the Task concept.

Answer 2

I'm guessing that instead of having one variable tThread storing the thread, you probably meant to store all the threads, so instead have a List of them. So something like:
Sub
Dim threads as New List(Of Thread)
For Each lvItem As ListViewItem In _ListView.SelectedItems
tThread = New Thread(AddressOf Me.myFunction())
tThread .Start()
threads.Add(tThread)
Next
End Sub
Otherwise, if there's another issue, please supply more details.

Answer 3

Are you sure the items are selected? I tried the following with a few items in the listview and it worked as expected.
Private Sub Button2_Click(ByVal sender As System.Object, _
ByVal e As System.EventArgs) Handles Button2.Click
For Each lvItem As ListViewItem In ListView1.SelectedItems
Dim t As Threading.Thread = New Threading.Thread(AddressOf myFunction)
t.Start(lvItem)
Next
End Sub
Private Sub myFunction(ByVal lvi As Object)
Dim lvItem As ListViewItem = CType(lvi, ListViewItem)
Debug.WriteLine(lvItem.Text)
End Sub