public void AddINVOICE_UDF_HEADRow(INVOICE_UDF_HEADRow row) {
     this.Rows.Add(row);
 }
 public void RemoveINVOICE_UDF_HEADRow(INVOICE_UDF_HEADRow row) {
     this.Rows.Remove(row);
 }
 public INVOICE_UDF_HEADRowChangeEvent(INVOICE_UDF_HEADRow row, System.Data.DataRowAction action) {
     this.eventRow = row;
     this.eventAction = action;
 }