iam not able to print in the correct in the correct formate in wpf

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C#

WPF

hi
good morning everybody , iam doing the application of printing, in wpf in C#.net, from my application the i am able to print the matter in textbox , but , the printing page look like a different font and different fontsize, and more over due to this iam not getting the visiable matter from the printer , so that i need to chanege the font and the size nad line spacing by using C# while printing , so please me an idea,

my sample code is

FlowDocument doc = new FlowDocument(new Paragraph(new Run(textBox1.Text)));
          doc.Name = "FlowDoc";
          IDocumentPaginatorSource idpSource = doc;
          PrintDialog printDlg = new System.Windows.Controls.PrintDialog();
          printDlg.PrintDocument(idpSource.DocumentPaginator, textBox1.Text);

give me and idea