alternative to performclick to do things in background

Hi, I'm searching for a way that let run a event without need, that specific form to be open, and also save thing.
I explain better, the performclick will only fire if that specific form it's open, I'm searching a way to do this on background.
This is the code of where performclick will fire (thanks to a timer)

 Private Sub Timer1_Tick(sender As Object, e As EventArgs) Handles Timer1.Tick
        Try
            Dim value As Integer = maxVal
            If Not IsNumeric(Label10.Text) Then
                Label10.Text = maxVal.ToString
            End If
            Integer.TryParse(Label10.Text, value)
            If value >= 1 And value <= maxVal Then
                value -= 1
                Label10.Text = value.ToString
            Else
                If value <= 0 Then
                    Form11.Button5.PerformClick()
                    Timer1.Stop()
                    Label10.Text = maxVal.ToString
                End If
            End If
        Catch ex As Exception

        End Try
    End Sub

This is the form11's button_5 code

  Private Sub Button5_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button5.Click
        Try
            For i As Integer = 0 To ComboBox3.Items.Count - 1
                ComboBox2.SelectedIndex = i
                Dim d As DateTime = DateTime.Now
                Dim parsedate As DateTime = ComboBox2.Items(i).ToString
                Dim d2 As DateTime = DateTime.ParseExact(parsedate, "dd/MM/yyyy HH:mm:ss", System.Globalization.CultureInfo.CurrentCulture)
                Dim ts As New TimeSpan((d - d2).Ticks)
                Dim dysdiff As Integer = ts.TotalDays
                Dim cbNum As Integer = 365 - dysdiff
                ComboBox3.Items(i) = cbNum.ToString
                Dim lstname As String
                lstname = ListBox1.Items(i).ToString()
                If cbNum <= 10 AndAlso cbNum >= 1 Then
                    NotifyIcon1.ShowBalloonTip(3000, "test", lstname & " have " & cbNum & " days left before will get delete", ToolTipIcon.None)
                End If
            Next
        Catch ex As Exception

        End Try
    End Sub