add GuessTheDice Windows Forms app

Form1.cs

@@ -1,10 +1,99 @@
+using System;
+using System.Windows.Forms;
+
 namespace GuessTheDice
 {
     public partial class Form1 : Form
     {
+        private int score = 0;
+
+        private Label lblTitle = null!;
+        private Label lblGuess = null!;
+        private Label lblResult = null!;
+        private Label lblScore = null!;
+        private NumericUpDown nudGuess = null!;
+        private Button btnRoll = null!;
+
         public Form1()
         {
             InitializeComponent();
+            BuildUI();
+        }
+
+        private void BuildUI()
+        {
+            this.Text = "Guess The Dice";
+            this.Size = new System.Drawing.Size(400, 350);
+            this.StartPosition = FormStartPosition.CenterScreen;
+
+            lblTitle = new Label()
+            {
+                Text = "🎲 Guess The Dice",
+                Font = new System.Drawing.Font("Arial", 16, System.Drawing.FontStyle.Bold),
+                TextAlign = System.Drawing.ContentAlignment.MiddleCenter,
+                Dock = DockStyle.Top,
+                Height = 60
+            };
+
+            lblGuess = new Label()
+            {
+                Text = "Tebak angka dadu (1-6):",
+                Left = 80, Top = 80, Width = 200
+            };
+
+            nudGuess = new NumericUpDown()
+            {
+                Minimum = 1, Maximum = 6, Value = 1,
+                Left = 80, Top = 105, Width = 80
+            };
+
+            btnRoll = new Button()
+            {
+                Text = "Roll Dice!",
+                Left = 80, Top = 145, Width = 120, Height = 40,
+                Font = new System.Drawing.Font("Arial", 11)
+            };
+            btnRoll.Click += BtnRoll_Click;
+
+            lblResult = new Label()
+            {
+                Text = "",
+                Left = 80, Top = 200, Width = 280, Height = 40,
+                Font = new System.Drawing.Font("Arial", 12, System.Drawing.FontStyle.Bold)
+            };
+
+            lblScore = new Label()
+            {
+                Text = "Skor: 0",
+                Left = 80, Top = 245, Width = 200,
+                Font = new System.Drawing.Font("Arial", 11)
+            };
+
+            this.Controls.AddRange(new Control[]
+            {
+                lblTitle, lblGuess, nudGuess, btnRoll, lblResult, lblScore
+            });
+        }
+
+        private void BtnRoll_Click(object? sender, EventArgs e)
+        {
+            Random rng = new Random();
+            int diceResult = rng.Next(1, 7);
+            int guess = (int)nudGuess.Value;
+
+            if (guess == diceResult)
+            {
+                score++;
+                lblResult.Text = $"🎯 Benar! Dadu: {diceResult}";
+                lblResult.ForeColor = System.Drawing.Color.Green;
+            }
+            else
+            {
+                lblResult.Text = $"❌ Salah! Dadu: {diceResult}";
+                lblResult.ForeColor = System.Drawing.Color.Red;
+            }
+
+            lblScore.Text = $"Skor: {score}";
         }
     }
 }