Timer will not start a second time - vb.net

Question

I've got a function:
Private Sub UpdateSch()
Threading.Thread.Sleep(50)
Dim i As Integer = 1
While i = 1
Try
If DataGridView1.Rows.Count > 1 Then
DataGridView1.Rows.Clear()
End If
Using stream As System.IO.FileStream = System.IO.File.OpenRead("Z:\\SchData.txt")
Using reader As New System.IO.StreamReader(stream)
Dim line As String = reader.ReadLine()
While (line IsNot Nothing)
Dim columns = line.Split(";")
line = reader.ReadLine()
Dim index = Me.DataGridView1.Rows.Add()
Me.DataGridView1.Rows(index).SetValues(columns)
End While
End Using
End Using
Button88.Enabled = True
DataGridView1.CurrentCell = DataGridView1.Rows(rowIndex).Cells(colIndex)
i = 0
Catch ex As Exception
Threading.Thread.Sleep(50)
End Try
End While
'Check for local updating
If updatingSch = False Then
DataGridView1.Enabled = False
LockWarning1.Visible = True
lockVar1 = 0
LockTimer1.Start()
Else
updatingSch = False
End If
End Sub
And then I've got a timer:
Private Sub LockTimer1_Tick(sender As Object, e As EventArgs) Handles LockTimer1.Tick
LockWarning1.Visible = False
DataGridView1.Enabled = True
LockTimer1.Stop()
End Sub
The function updateSch is called at form load and whenever the file is changed. It locks the DataGridView, starts the timer which runs for 10 sec, and then unlocks the Datagridview. This all works on load, but when it is called again it locks and never unlocks. The second time around the timer is never started. (I put a break point on the "LockTimer1.Start()" and it is executed the second time, but the LockTimer_Tick event doesn't fire after that)

Answer 1

I've found a soution to my problem. For the life of me I can't figure out why my previous code won't work. What I was able to get working was a Systems.Timers.Timer (instead of System.Windows.Forms.Timer). My code creating the timer looks like this:
Dim LockTimer1 As New System.Timers.Timer()
LockTimer1.Interval = 10000
LockTimer1.AutoReset = False 'Run timer only once
LockTimer1.Start()
AddHandler LockTimer1.Elapsed, AddressOf LockTimer1_Tick
And then the function LockTimer1_tick:
Private Sub LockTimer1_Tick(ByVal sender As Object, ByVal e As ElapsedEventArgs)
LockWarning1.Visible = False
DataGridView1.Enabled = True
Button88.Enabled = True
Button1.Enabled = True
End Sub