how to change a string's font?

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WinForms

Win7

string

font

Hi, I am making an APA web based citation generator. All is well but I seem to be having trouble making a string have an Italic font, Here is my code.

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        string author;
        string date;
        string TitleOfArticle;
        string Retriveddate;
        string websiteURl;
        string citation;

        private void Form1_Load(object sender, EventArgs e)
        {
            AuthorBox.Items.Add("unidentified");
            PublishBox.Items.Add("n.d");

            TitleBox.Text.Equals(Font.Italic);
        }

        private void button1_Click(object sender, EventArgs e)
        {
            //issues: make the richtextbox display title as italic.

            author = AuthorBox.Text;
            date = PublishBox.Text;
            TitleOfArticle = TitleBox.Text;
            Retriveddate = RetrivedBox.Text;
            websiteURl = URLBox.Text;
            citation = author + " ." + "(" + date + "). " + TitleOfArticle + ". Retrieved " + Retriveddate + ", from " + websiteURl;
            richTextBox1.Text = citation;
        }

        private void button3_Click(object sender, EventArgs e)
        {
            richTextBox1.Copy();
        }

        private void button2_Click(object sender, EventArgs e)
        {
            richTextBox1.Clear();
        }
    }
}

As you can see in my sample code I have strings for each combobox and they record the user's input for each box. Then I combine all of them and put it into 1 string called "Citation" and when the user presses a button this string is displayed in a richtextbox. In a proper web citation for APA the title of the webpage needs to be Italic. How can I change the font style of the title and make it Italic when the user generates the citation? The string for the title of webpage is called "TitleOfArticle".

I appreciate everyones help.

Thanks.