RTB issue

[Techno]

coloring and insertion of text! Something struck me.

Now, if I have text in the RTB and I want to color it, then insert more text at the end, the last color set gets used to write the new text, even if I change the color after selecting the color of the text to color.

this.richTextBox1.SelectionStart = 0;
this.richTextBox1.SelectionLength = this.richTextBox1.Text.Length;
this.richTextBox1.SelectionColor = Color.Blue;
this.richTextBox1.SelectionStart = this.richTextBox1.Text.Length;
this.richTextBox1.SelectionLength = 0;
            
this.richTextBox1.SelectionColor = Color.Black;

this.richTextBox1.Text += "new text here";

however if I replace the last line with .AppendText(), it works great!

Question: why?


next Q: if I wanted to insert text, again with a specific color, to the text already, how would I do this without changing the text color of the existing text in the RTB control?