WPF RichTextBox Text and Font Extension Methods

using System.Drawing;
using System.Windows.Controls;
using System.Windows.Documents;

public static class ExtensionMethods
{
    public static string GetText(this RichTextBox textBox)
    {
        TextRange textRange = new TextRange(textBox.Document.ContentStart, textBox.Document.ContentEnd);
        return textRange.Text;
    }

    public static Font GetFont(this RichTextBox textBox)
    {
        FontFamily fontfam = new FontFamily(textBox.FontFamily.Source);
        Font font = new Font(fontfam, (float)textBox.FontSize);
        return font;
    }

}