Create Check boxes for Bold Italic Underline and Radio Button for Changing Color | Window Form | C#

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 bold_italic_underine_change_color
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}

private void radioButton1_CheckedChanged(object sender, EventArgs e)
{
this.BackColor = Color.Red;
}

private void radioButton2_CheckedChanged(object sender, EventArgs e)
{
this.BackColor = Color.Green;
}

private void radioButton3_CheckedChanged(object sender, EventArgs e)
{
this.BackColor = Color.Pink;
}

private void checkBox1_CheckedChanged(object sender, EventArgs e)
{

}

private void button1_Click(object sender, EventArgs e)
{
if (checkBox1.Checked == true && checkBox2.Checked == true && checkBox3.Checked == true)
{
textBox1.Font = new Font(textBox1.Font, FontStyle.Bold | FontStyle.Italic | FontStyle.Underline);
textBox2.Font = new Font(textBox2.Font, FontStyle.Bold | FontStyle.Italic | FontStyle.Underline);
label3.Font = new Font(textBox2.Font, FontStyle.Bold | FontStyle.Italic | FontStyle.Underline);
}
else if (checkBox1.Checked == true && checkBox2.Checked == true)
{
textBox1.Font = new Font(textBox1.Font, FontStyle.Bold | FontStyle.Italic);
textBox2.Font = new Font(textBox2.Font, FontStyle.Bold | FontStyle.Italic);
label3.Font = new Font(label3.Font, FontStyle.Bold | FontStyle.Italic);
}
else if (checkBox1.Checked == true && checkBox3.Checked == true)
{
textBox1.Font = new Font(textBox1.Font, FontStyle.Bold | FontStyle.Underline);
textBox2.Font = new Font(textBox2.Font, FontStyle.Bold | FontStyle.Underline);
label3.Font = new Font(label3.Font, FontStyle.Bold | FontStyle.Underline);
}
else if (checkBox2.Checked == true && checkBox3.Checked == true)
{
textBox1.Font = new Font(textBox1.Font, FontStyle.Italic | FontStyle.Underline);
textBox2.Font = new Font(textBox2.Font, FontStyle.Italic | FontStyle.Underline);
label3.Font = new Font(label3.Font, FontStyle.Italic | FontStyle.Underline);
}
else if (checkBox1.Checked == true)
{
textBox1.Font = new Font(textBox1.Font, FontStyle.Bold);
textBox2.Font = new Font(textBox1.Font, FontStyle.Bold);
label3.Font = new Font(label3.Font, FontStyle.Bold);
}
else if (checkBox2.Checked == true)
{
textBox1.Font = new Font(textBox1.Font, FontStyle.Italic);
textBox2.Font = new Font(textBox1.Font, FontStyle.Italic);
label3.Font = new Font(label3.Font, FontStyle.Italic);
}
else if (checkBox3.Checked == true)
{
textBox1.Font = new Font(textBox1.Font, FontStyle.Underline);
textBox2.Font = new Font(textBox1.Font, FontStyle.Underline);
label3.Font = new Font(label3.Font, FontStyle.Underline);
}
label3.Text = textBox1.Text + "\n" + textBox2.Text;


}
}
}