Passing multiple selected records from grid.

My Scenario : In Payment journal form i need to close all line form by clicking button .

or

Same form in blocking tab a field named as Locked by system it should be checked or unchecked.

Solution: I have created one command button in form and add new clicked method, code as shown below.

void clicked()

{

MultiSelectionHelper        multiSelectionHelper;
LedgerJournalTable           multiLedgerJournalTable;
LedgerJournalTable           ledgerJrnTable;
super();
multiSelectionHelper = MultiSelectionHelper::construct();
multiSelectionHelper.parmDatasource(ledgerJournalTable_ds);
multiLedgerJournalTable = multiSelectionHelper.getFirst();
while (multiLedgerJournalTable.RecId != 0 )
{

                    ledgerJrnTable = LedgerJournalTable::find(multiLedgerJournalTable.JournalNum, true);

if(ledgerJrnTable.SystemBlocked == NoYes::Yes
&& ledgerJrnTable.JournalNum   == multiLedgerJournalTable.JournalNum)
{

                    ttsBegin;

ledgerJrnTable.SystemBlocked = NoYes::No;
ledgerJrnTable.update();
ttsCommit;
}
multiLedgerJournalTable = multiSelectionHelper.getNext();

}
ledgerJournalTable_ds.research(true);

}