Partially Bold Text in RichTextBox

Vijay Prativadi
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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);
}
}
}
}