RichTextBox font set to all lines in C#

Question

I changed the font of a RichTextBox, but this change does not set to all of its characters properly. Indeed there exist two font for the RichTextBox and that is not beautifu

Answer 1

Set the selection to the entire box and set the SelectionFont.

this.richTextBox1.SelectionStart = 0;
this.richTextBox1.SelectionLength = this.richTextBox1.SelectionLength;
this.richTextBox1.SelectionFont = new System.Drawing.Font("Maiandra GD", 12);