Create and posting Sales order through X++ in ax 2012

static void createSalesTable(CustAccount _custAccount)
{
SalesTable salesTable;
NumberSeq NumberSeq;
;
NumberSeq = NumberSeq::newGetNumFromCode(SalesParameters::numRefSalesId().numberSequence);
salesTable.SalesId = NumberSeq.num();
salesTable.initValue();
salesTable.CustAccount = _custAccount;
salesTable.initFromCustTable();
salesTable.insert();
}
Example: Create a Sales Line
static void createSalesLine(SalesId _salesId, ItemId _itemId)
{
SalesLine salesLine;
;
salesLine.clear();
salesLine.SalesId = _salesId;
salesLine.ItemId = _itemId;
salesLine.createLine(NoYes::Yes, // Validate
NoYes::Yes, // initFromSalesTable
NoYes::Yes, // initFromInventTable
NoYes::Yes, // calcInventQty
NoYes::Yes, // searchMarkup
NoYes::Yes); // searchPrice
}
//Code for posting Sales order Invoice
static void createSalesOrder(Args _args)
{
SalesFormLetter formLetterObj;
formLetterObj = SalesFormLetter::construct(DocumentStatus::Invoice);
formLetterObj.update(SalesTable::find( gSO-101248  ));
}