fpSpread1.AllowColumnMove = true;
fpSpread1.ColumnDragMove +=new FarPoint.Win.Spread.DragMoveEventHandler(fpSpread1ColumnDragMove);
private void fpSpread1ColumnDragMove(object sender, FarPoint.Win.Spread.DragMoveEventArgs e)
{
      if (e.Index < 3)
      { 
            e.Cancel = true;
      }
}
	 
	
		FpSpread1.AllowColumnMove = True
Dim eh As FarPoint.Win.Spread.DragMoveEventHandler = AddressOf Fpspread1ColumnDragMove
AddHandler FpSpread1.ColumnDragMove, eh
Private Sub Fpspread1ColumnDragMove(ByVal sender As Object, ByVal e As FarPoint.Win.Spread.DragMoveEventArgs) Handles FpSpread1.ColumnDragMove
      If e.Index < 3 Then
            e.Cancel = True
End Sub