private void tabNormView_Enter(object sender, EventArgs e) { _allLabourNormForSeries = LinqQueryForTrudoyomkost.GetAllLabourNormForSeria(_seriaFrom, _seriaTo, _selectProdCipher); dgLabourViewer.DataSource = _allLabourNormForSeries; if (dgLabourViewer.Columns.Count != 0) { UserDataTables.SetDgColumns(dgLabourViewer); } }