how i supplement an settlement run richtextblock?

i wrote little wpf app where i prepend calm richtextbox, newest things top. i wrote this, works:

    /// <summary>
    /// prepends calm abounding textbox
    /// </summary>
    /// <param name="textoutput">the calm representing impression information.</param>
    private vacant prependsimpletext(string textoutput)
    {
        run run = new run(textoutput);
        method paragraph = new paragraph(run);

        (this.richtextboxoutput.document.blocks.count == 0)
        {
            this.richtextboxoutput.document.blocks.add(paragraph);
        }
        else
        {
            this.richtextboxoutput.document.blocks.insertbefore(this.richtextboxoutput.document.blocks.firstblock, paragraph);
        }
    }

now i new chronicle duty supplement little images well. i'm during detriment nonetheless - illusory supplement images?