Cross-thread operation not valid: Control accessed from a thread other than the thread it was created on.

hi experts,
I see quite a lot of questions on this error but haven't figured it out.
Here's the situation
MAIN FORM-->User clicks on menu and is presented with new form "CalculationsForm"

Dim f As New CalculationsForm()
f.ShowDialog()

User picks some stuff and clicks "OK" on "CalculationsForm. "OK" starts the calculations

 Private Sub OK_Button_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles OK_Button.Click
        Try
            Me.OK_Button.Enabled = False

            ProgressLabel.Show()
            ProgressBar1.Show()

            ProgressStatus = 0

'start calculations here
            BackgroundWorker1.RunWorkerAsync()
        Catch ex As Exception
            Utils.LogException(ex)
        End Try
    End Sub

  Private Sub BackgroundWorker1_DoWork(ByVal sender As System.Object, ByVal e As System.ComponentModel.DoWorkEventArgs) Handles BackgroundWorker1.DoWork
do lots of stuff here.....

'finished doing stuff
  BackgroundWorker1.ReportProgress(100)

'Now close the form: ERROR HERE!
Me.close

  end sub

The line "Me.close" gives error. I have tried putting it in the Backgroundworker completed too but no joy.

I just want to close the form on completion of calcs without this cross-thread error.

Help please thank-youStart Free Trial