How do i set focus to a specific asp.net 4.0 control after an autopostback from a different control?

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VB

forms

web

ASP.NET4

My asp.net 4.0 page has two textboxes for the user to enter his email address.

The first textbox has code behind to validate that the email address is in a valid email address format. After the autopostback from this text box which causes the format validation to occur, focus returns to the first textbox. I would like to set the focus to the second textbox to make sure that a wrong email address was entered in a "Valid" format.

Does anyone have an idea how to do this?

What I have tried:

The following code does not work. It sets the focus, to the next text box but when the autopostback completes the focus returns to the first text box.

Private Sub TextContactEmail_TextChanged(sender As Object, e As EventArgs) Handles TextContactEmail.TextChanged
       Session.Add("LastHadFocus", "TextContactEmail")
       If Not IsValidEmail(TextContactEmail.Text) Then
           lblInvalidEmailAddress2.Visible = True
           TextContactEmail.Text = ""
       Else
           lblInvalidEmailAddress2.Visible = False
           TextCompareContactEmail.Text = ""
           TextCompareContactEmail.Focus()
       End If
   End Sub