How to using code create sales order

/*sales Order using X++
Hi,In this post we will learn the below using X++ :
 1) How to Create Sales Order
 2) How to Create Sales Order Line
 3) How to Post Sales Order
*/
public static void THK_createSalesOrderDemo(Args _s)
{
// Create the Sales Order
    SalesTable      salesTable;
    SalesLine       sl;
    
    SalesId         sid;
    NumberSeq       NumberSeq;
    SalesFormLetter fl;
;
    NumberSeq           = NumberSeq::newGetNumFromCode(SalesParameters::numRefSalesId().numberSequence);
    sid                 = NumberSeq.num();
    
    //create sales order header
    salesTable.SalesId  = sid;
    salesTable.initValue();
    salesTable.CustAccount = "1101";
    salesTable.initFromCustTable();
    salesTable.insert();

    //Create the Sales Line with the created Sales Order
    sl.SalesId = sid;
    sl.ItemId  = "1109";
    sl.CreateLine(NoYes::Yes,NoYes::Yes,NoYes::Yes,NoYes::Yes,NoYes::Yes,NoYes::Yes);

    info("Sales Order Created with Line");

    //How to Post the Sales Order Invoice
    fl=SalesFormLetter::construct(DocumentStatus::Invoice);
    fl.update(SalesTable::find(sid));
    info("Sales Order Posted");
}