private void Button1_Click ( object sender, EventArgs MyEventArgs ) {
   // Find control on page.
   Control myControl1 = FindControl ( "TextBox2" );
   if ( myControl1 != null ) {
      // Get control's parent.
      Control myControl2 = myControl1.Parent;
      Response.Write ( "Parent of the text box is : " + myControl2.ID );
   } else {
      Response.Write ( "Control not found" );
   }
}

Private Sub Button1_Click ( sender As Object, MyEventArgs As EventArgs )
   ' Find control on page.
   Dim myControl1 As Control = FindControl ( "TextBox2" )
   If ( Not myControl1 Is Nothing )
      ' Get control's parent.
      Dim myControl2 As Control = myControl1.Parent
      Response.Write ( "Parent of the text box is : " & myControl2.ID )
   Else
      Response.Write ( "Control not found" )
   End If
End Sub