C# - Change font of text in RichTextBox dynamically?

Question

I am having some text in a "richTextBox" and a "comboBox" having names of some fonts. I want to change the font of text in "richTextBox" if a new font is selected from the "comboBox". I am using following code.

private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
{
    if (comboBox1.SelectedIndex == 1)
        richTextBox1.Font = new Font("Comic Sans MS", 14);
}

The problem is that if I select the font, the text does not change its font automatically, it only changes if I type some new text. I also tried richTextBox1.SelectionFont instead of richTextBox1.Font. I also added InputTextBox.Refresh(); after the above code to refresh the text box but in vein.

How I can change font of the text by just selecting from comboBox?

Update: I just figured out that above code is fine, the problem is that I was using wrong event call, used comboBox1_SelectedValueChanged() in place of comboBox1_SelectedIndexChanged() and it works fine now.

Tip: If you want to change font of entire TextBox use richTextBox1.Font, if you want to change font of selected text only use richTextBox1.SelectionFont.

Answer 1

You could select all the text before changing SelectedFont option:

this.richTextBox1.SelectAll();
this.richTextBox1.SelectionFont = newFont;