private void Button_Click(object sender, RoutedEventArgs e)
{
var blockFormatterFactory = new BlockFormattersFactory();
var pm = new PrintManager();
var formatter = new SimpleFlowDocumentDataFormatter();
formatter.AppendBlocks(blockFormatterFactory.Header("Simple text sample"));
formatter.AppendBlocks(blockFormatterFactory.Text(textBox.Text));
var doc = new SimpleDocument(formatter);
pm.PrintPreview(doc);
}