GUIDacious/GUIDacious/GuidForm.cs

using System;
using System.Linq;
using System.Windows.Forms;

namespace GUIDacious {
    public partial class GuidForm : Form {
        private Guid _currentGuid;

        private Guid CurrentGuid {
            get => _currentGuid;
            set {
                _currentGuid = value;
                RefreshView();
            }
        }

        public GuidForm() {
            InitializeComponent();
            NewGuid();
        } 

        private string ComponentsString(bool upperCase = false) {
            // Byte counts per components: 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1

            var bytes = CurrentGuid.ToByteArray();
            var c0 = BitConverter.ToString(bytes.Take(4).ToArray()).Replace("-", "");
            var c1 = BitConverter.ToString(bytes.Skip(4).Take(2).ToArray()).Replace("-", "");
            var c2 = BitConverter.ToString(bytes.Skip(6).Take(2).ToArray()).Replace("-", "");
            var result = $"0x{c0}, 0x{c1}, 0x{c2}, 0x{bytes[8]:x2}, 0x{bytes[9]:x2}, 0x{bytes[10]:x2}, 0x{bytes[11]:x2}, 0x{bytes[12]:x2}, 0x{bytes[13]:x2}, 0x{bytes[14]:x2}, 0x{bytes[15]:x2}";

            return upperCase
                       ? result.ToUpper().Replace("X", "x")
                       : result.ToLower();
        }

        private void CopyButton_Click(object sender, EventArgs e) =>
            Clipboard.SetText(GuidFormatBox.Text);

        private void Format_CheckedChanged(object sender, EventArgs e) =>
            RefreshView();

        private void NewGuid() => CurrentGuid = Guid.NewGuid();

        private void NewGuidButton_Click(object sender, EventArgs e) => NewGuid();

        private void RefreshView() {
            CurrentGuidDisplay.Text = CurrentGuid.ToString();

            if(FormatStringLower.Checked) {
                GuidFormatBox.Text = CurrentGuid.ToString();
            } else if(FormatStringUpper.Checked) {
                GuidFormatBox.Text = CurrentGuid.ToString().ToUpper();
            } else if(FormatComponentsLower.Checked) {
                GuidFormatBox.Text = ComponentsString();
            } else if(FormatComponentsUpper.Checked) {
                GuidFormatBox.Text = ComponentsString(true);
            } else if(FormatNewGuid.Checked) {
                GuidFormatBox.Text = $"new Guid({ComponentsString()});";
            }
        }
    }
}