Rich Text Box how to highlight text block

Question

I need a certain portion of my text in RTB to be highlighted not in the sense of changing the font style/color, but in the sense of making a block selection with a particula

Answer 1

Yes you can set the BackColor of a RichTextBox Selection using the RichTextBox.SelectionBackColor Property.

int blockStart = 1; //arbitrary numbers to test
int blockLength = 15;
richTextBox1.SelectionStart = blockStart;
richTextBox1.SelectionLength = blockLength;
richTextBox1.SelectionBackColor = Color.Yellow;