Partially Bold Text in RichTextBox

Introduction

In this blog, we will see how to partially bold text in RichTextBox.

Step 1: Create a new windows forms application.



Form1.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace RichTextBox_BoldPartialText
{
    public partial class Form1: Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        private void Form1_Load(object sender, EventArgs e)
        {
            for (int i = 0; i < 2; i++)
            {
                string str = "Hello";
                string str1 = "Hello1";
                int length = richTextBox1.Text.Length;
                richTextBox1.AppendText((((Convert.ToString((str + Convert.ToString(": "))) + str1) + "\r") + "\n"));
                richTextBox1.Select(length, str.Length);
                richTextBox1.SelectionFont = new Font(richTextBox1.Font, FontStyle.Bold);
            }
        }
    }
}

RichTextBox



Output of the application looks like this



Summary

In this blog, we have seen how to partially bold text in RichTextBox.

Happy coding!