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Editorial Team
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Asked: 2026-05-14T21:32:48+00:00

My application needs to print invoices, then a get the invoice from database, insert

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My application needs to print invoices, then a get the invoice from database, insert information on the invoice in a big string (telling the line, column, etc.) after this I have the string ready to be sent to a printer.

My problem is: I need to put some ESC/P commands/characters in my big string

I tried to do something like this:

        char formFeed = (char)12;
        Convert.ToChar(12);

        MyBigString.Insert(10, formFeed);

Whith this, the line 10 will do a FormFeed, but this doesn’t work

NOTE: I send the MybigString all at once to the printer.

To make my code works, I need to send the data line by line to a printer?

Thanks for the help.

PS: Sorry, for my English, I’am a Brazilian developer which don’t speak English (yet).

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1 Answer

  1. Editorial Team

    Bypassing the printer driver and controlling the printer directly, using its native command language, is a supported scenario. The P/Invoke is explained well in this KB article.

    Sure you want to do this? It is uncommon, to put it mildly, usually only attempted with low-cost Point-Of-Sale thermal or matrix printers. If you don’t like the mechanics of PrintDocument.PrintPage, nobody does, you could consider my code in this thread. Note the FormFeed method.

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