I need some help, how to do this in Visual Dataflex?

handle bold on an Epson TM T20x

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// … prior plumbing code removed for brevity
// this code assumed you've already created a receipt print job (printJob)
// and also that you've already checked the PosPrinter Capabilities to
// verify that the printer supports Bold and DoubleHighDoubleWide print modes

const string ESC = "\u001B";
const string GS = "\u001D";
const string InitializePrinter = ESC + "@";
const string BoldOn = ESC + "E" + "\u0001";
const string BoldOff = ESC + "E" + "\0";
const string DoubleOn = GS + "!" + "\u0011"; // 2x sized text (double-high + double-wide)
const string DoubleOff = GS + "!" + "\0";

printJob.Print(InitializePrinter);
printJob.PrintLine("Here is some normal text.");
printJob.PrintLine(BoldOn + "Here is some bold text." + BoldOff);
printJob.PrintLine(DoubleOn + "Here is some large text." + DoubleOff);

printJob.ExecuteAsync();