Text redactor

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

namespace Zadacha
{
    public partial class Form : System.Windows.Forms.Form
    {

        public Form()
        {
            InitializeComponent();
        }

        private void boldButton_Click(object sender, EventArgs e)
        {
            if (text.SelectionFont.Bold)
            {
                if (text.SelectionFont.Underline)
                {
                    if (text.SelectionFont.Italic)
                    {
                        setFont(false, true, true);
                    }
                    else
                    {
                        setFont(false, true, false);
                    }
                }
                else
                {
                    setFont(false, false, false);
                }
            }
            else
            {
                text.SelectionFont = new Font(text.SelectionFont, text.SelectionFont.Style | FontStyle.Bold);
            }
        }

        private void clear_Click(object sender, EventArgs e)
        {
            text.Clear();
        }

        private void italicButton_Click(object sender, EventArgs e)
        {
            if (text.SelectionFont.Italic)
            {
                if (text.SelectionFont.Bold)
                {
                    if (text.SelectionFont.Underline)
                    {
                        setFont(true, true, false);
                    }
                    else
                    {
                        setFont(true, false, false);
                    }
                }
                else
                {
                    setFont(false, false, false);
                }
            }
            else
            {
                text.SelectionFont = new Font(text.SelectionFont, text.SelectionFont.Style | FontStyle.Italic);
            }


        }

        private void underlineButton_Click(object sender, EventArgs e)
        {
            if (text.SelectionFont.Underline)
            {
                if (text.SelectionFont.Bold)
                {
                    if (text.SelectionFont.Italic)
                    {
                        setFont(true, false, true);
                    }
                    else
                    {
                        setFont(true, false, false);
                    }
                }
                else
                {
                    setFont(false, false, false);
                }
            }
            else
            {
                text.SelectionFont = new Font(text.SelectionFont, text.SelectionFont.Style | FontStyle.Underline);
            }


        }

        private void setFont(bool wasB, bool wasU, bool wasI)
        {
            if (wasB)
            {
                if (wasI)
                {
                    text.SelectionFont = new Font(text.SelectionFont, FontStyle.Bold | FontStyle.Italic | FontStyle.Regular);
                }
                else if (wasU)
                {
                    text.SelectionFont = new Font(text.SelectionFont, FontStyle.Bold | FontStyle.Underline | FontStyle.Regular);
                }
            }
            if (wasU)
            {
                if (wasB)
                {
                    text.SelectionFont = new Font(text.SelectionFont, FontStyle.Bold | FontStyle.Underline | FontStyle.Regular);
                }
                else if (wasI)
                {
                    text.SelectionFont = new Font(text.SelectionFont, FontStyle.Italic | FontStyle.Underline | FontStyle.Regular);
                }
            }
            if (wasI)
            {
                if (wasU)
                {
                    text.SelectionFont = new Font(text.SelectionFont, FontStyle.Underline | FontStyle.Italic | FontStyle.Regular);
                }
                else if (wasB)
                {
                    text.SelectionFont = new Font(text.SelectionFont, FontStyle.Bold | FontStyle.Italic | FontStyle.Regular);
                }
            }
        }

        private void fontSize_SelectedIndexChanged(object sender, EventArgs e)
        {
            FontChange();
        }
        private void FontChange()
        {
            // throw new Not Implemented Exception();
            float fontsize = 10;
            string fontfamily = fontFont.SelectedItem.ToString();
            string fontname = text.SelectionFont.Name;
            if (fontSize.Text != "") fontsize = float.Parse(fontSize.Text);
            if (fontsize == 0) fontsize = 10;
            if (text.SelectionLength > 0)
            {
                text.SelectionFont = new Font(fontfamily, fontsize, text.SelectionFont.Style);
            }
        }

        private void fontFont_SelectedIndexChanged(object sender, EventArgs e)
        {
            float fontsize = text.SelectionFont.Size;
            string fontfamily = fontFont.SelectedItem.ToString();
            if (fontfamily != "")
            {
                text.SelectionFont = new Font(fontfamily, fontsize, text.SelectionFont.Style);
            }
        }
        bool click = false;
        private void fontColor_Click(object sender, EventArgs e)
        {

            click = true;
            change(true);
        }
        private void change(bool fontOrSize)
        {
            if (click == true)
            {
                ColorDialog fd = new ColorDialog();

                if (fd.ShowDialog() == DialogResult.OK)
                {
                    if (fontOrSize)
                    {
                        text.SelectionColor = fd.Color;
                    }
                    else
                    {
                        text.SelectionBackColor = fd.Color;
                    }
                }
            }
        }

        private void fontBGColor_Click(object sender, EventArgs e)
        {
            click = true;
            change(false);
        }

        private void save_Click(object sender, EventArgs e)
        {
            string path = Directory.GetCurrentDirectory();
            using (StreamWriter writer = new StreamWriter("saved.txt"))
            {
                foreach (var item in text.Text)
                {
                    writer.Write(item);
                }
            }
        }

        private async void load_Click(object sender, EventArgs e)
        {
            OpenFileDialog fd = new OpenFileDialog();

            fd.Filter = "txt files (*.txt)|*.txt|All files (*.*)|*.*";
            if (fd.ShowDialog() == DialogResult.OK)
            {
                using (Stream stream = fd.OpenFile())
                {
                    using (var reader = new StreamReader(stream))
                    {
                        string line = await reader.ReadToEndAsync();
                        text.Text = line;
                    }
                }
            }

        }

        private void Form_Load(object sender, EventArgs e)
        {

        }
    }
}