ModernDashboard

Form1.cs

using System;
using System.Drawing;
using System.Windows.Forms;
using System.Runtime.InteropServices;

namespace Dashboard
{
    public partial class Form1 : Form
    {

        //Dùng để bo tròn 4 góc màn hình
        [DllImport("Gdi32.dll", EntryPoint = "CreateRoundRectRgn")]

        private static extern IntPtr CreateRoundRectRgn
         (
               int nLeftRect,
               int nTopRect,
               int nRightRect,
               int nBottomRect,
               int nWidthEllipse,
               int nHeightEllipse

         );

        public Form1()
        {
            InitializeComponent();
            Region = System.Drawing.Region.FromHrgn(CreateRoundRectRgn(0, 0, Width, Height, 25, 25));
            panelNavigator.Height = btnDashboard.Height;
            panelNavigator.Top = btnDashboard.Top;
            panelNavigator.Left = btnDashboard.Left;
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            //Select Dashboard screen as default when init
            btnDashboard.PerformClick();//btnDashboard.BackColor = Color.FromArgb(46, 51, 73);
            unDisplayButton(btnDashboard);
        }

        void displayButton(string displayedString, Button selectedButton, Form selectedForm)
        {
            panelNavigator.Height = selectedButton.Height;
            panelNavigator.Top = selectedButton.Top;
            panelNavigator.Left = selectedButton.Left;
            selectedButton.BackColor = Color.FromArgb(46, 51, 73);

            labelTitle.Text = displayedString;
            this.panelFormLoader.Controls.Clear();
            selectedForm.FormBorderStyle = FormBorderStyle.None;
            this.panelFormLoader.Controls.Add(selectedForm);
            selectedForm.Show();
        }

        void unDisplayButton(Button selectedButton)
        {
            selectedButton.BackColor = Color.FromArgb(24, 30, 54);
        }

        private void btnDashboard_Click(object sender, EventArgs e)
        {
            FormDashboard frmDashboard = new FormDashboard() { Dock = DockStyle.Fill, TopLevel = false, TopMost = true };
            displayButton("Dashboard", btnDashboard, frmDashboard);
        }

        private void btnAnalytics_Click(object sender, EventArgs e)
        {
            FormAnalytics frmAnalytics = new FormAnalytics() { Dock = DockStyle.Fill, TopLevel = false, TopMost = true };
            displayButton("Analytics", btnAnalytics, frmAnalytics);
        }

        private void btnCalendar_Click(object sender, EventArgs e)
        {
            FormCalendar frmCalendar = new FormCalendar() { Dock = DockStyle.Fill, TopLevel = false, TopMost = true };
            displayButton("Calendar", btnCalendar, frmCalendar);
        }

        private void btnContactUs_Click(object sender, EventArgs e)
        {
            FormContactUs frmContactUs = new FormContactUs() { Dock = DockStyle.Fill, TopLevel = false, TopMost = true };
            displayButton("Contact Us", btnContactUs, frmContactUs);
        }

        private void btnSettings_Click(object sender, EventArgs e)
        {
            FormSettings frmSettings = new FormSettings() { Dock = DockStyle.Fill, TopLevel = false, TopMost = true };
            displayButton("Settings", btnSettings, frmSettings);
        }

        private void btnDashboard_Leave(object sender, EventArgs e)
        {
            unDisplayButton(btnDashboard);
        }

        private void btnAnalytics_Leave(object sender, EventArgs e)
        {
            unDisplayButton(btnAnalytics);
        }

        private void btnCalendar_Leave(object sender, EventArgs e)
        {
            unDisplayButton(btnCalendar);
        }

        private void btnContactUs_Leave(object sender, EventArgs e)
        {
            unDisplayButton(btnContactUs);
        }

        private void btnSettings_Leave(object sender, EventArgs e)
        {
            unDisplayButton(btnSettings);
        }

        private void btnExit_Click(object sender, EventArgs e)
        {
            Application.Exit();
        }
    }
}