Break line in printdocument in C# winform

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C#

hi every one i try to make Customer Receipts using PrintDocuments Control and now i want to display the footer on Customer Receipts. The Foter Text stored in a string type Variable.
String Fotertex="ABC DEF GHIJK LMNOP QRSTUVWXYZ AAA BBBBBBB ABCD";
but i use thermal printer for Customer Receipts.
and the text that display only in foter is "

ABC DEF GHIJK LMNOP

"
Now i want it automatically break the line and the renaming Text "

QRSTUVWXYZ AAA BBBBBBB ABCD

" Display on Next line.
i simply want if the text Character greater then 19 it break the line and printer the renaming text in Next line.
Thanks in advance

What I have tried:

i try this but its not working i dont know why its not working

if (Fotertex.ToString().Length > 19)
          {
              graphics.DrawString(Fotertex.ToString().Substring(0, 19), myfont, Brushes.Black, new Point(10, startY = startY + 40));
          }