1.] How can I append a formatted text to a RichTextBox
Control? I've used the .TextRTF property but it seems not
working. Here's what I did:

RichTextBox1.TextRTF=RichTextBox1.TextRTF+RichSamp.TextRTF


2.] How can I append a Text in the RichTextBox without
referencing to the entire text. If you use

RichTextBox1.TextRTF=RichTextBox1.TextRTF+RichSamp.TextRTF

you are actually placing the entire text of the
RichTextBox1 to the memory... right? What if my
RichTextBox contains 500kb of text or more? Can I not have
a pointer and points to the end of the text and place the
text (formatted) right there without touching the other
texts?