diff --git a/Services/userService.cs b/Services/userService.cs
new file mode 100644
index 0000000..4de990b
--- /dev/null
+++ b/Services/userService.cs
@@ -0,0 +1,131 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+
+namespace DemoApp.Services
+{
+    // Wrong naming - should be PascalCase
+    public class userService
+    {
+        // Public field instead of property
+        public string username;
+
+        // Missing m_ prefix for private field
+        private int userId;
+
+        // No #region blocks for organization
+
+        public string connectionString = "Server=localhost;Database=demo;User=sa;Password=admin123";
+
+        // Inconsistent parameter casing
+        public async Task<string> GetData(string InputParam)
+        {
+            // Wrong casing for local variable
+            string Result = "";
+
+            // SQL Injection vulnerability
+            var query = "SELECT * FROM Users WHERE Name = '" + InputParam + "'";
+
+            // Hardcoded password
+            var password = "admin123";
+
+            // Not using async properly
+            var users = GetAllUsers().Result;
+
+            // String concatenation in loop
+            for (int i = 0; i < users.Count; i++)
+            {
+                Result = Result + users[i].Name + ", ";
+            }
+
+            // This method is way too long (imagine 50+ more lines here)
+            // Violating the 30-line rule
+
+            // Deep nesting example
+            if (InputParam != null)
+            {
+                if (InputParam.Length > 0)
+                {
+                    if (InputParam.Contains("admin"))
+                    {
+                        if (password == "admin123")
+                        {
+                            // Too deeply nested
+                            return "Admin access granted";
+                        }
+                    }
+                }
+            }
+
+            // Magic number without constant
+            if (users.Count > 100)
+            {
+                return "Too many users";
+            }
+
+            // Missing null checks
+            var firstUser = users.First();
+
+            // Not disposing resources
+            var connection = new System.Data.SqlClient.SqlConnection(connectionString);
+            connection.Open();
+            // Never closed or disposed
+
+            // Missing XML documentation
+            // Missing error handling
+            // Missing parameter validation
+
+            return Result;
+        }
+
+        // Method name should be PascalCase
+        public void processOrder(int OrderId)
+        {
+            // Local variable should be camelCase
+            var OrderStatus = "Processing";
+
+            // Public method without any documentation
+        }
+
+        // Missing async on method that returns Task
+        public Task<List<User>> GetAllUsers()
+        {
+            // Synchronous operation returning Task
+            var users = new List<User>();
+            return Task.FromResult(users);
+        }
+
+        // N+1 query pattern example
+        public void LoadUserOrders()
+        {
+            var users = GetAllUsers().Result;
+
+            foreach (var user in users)
+            {
+                // This would execute a query for each user
+                var orders = GetOrdersForUser(user.Id);
+                user.Orders = orders;
+            }
+        }
+
+        private List<Order> GetOrdersForUser(int userId)
+        {
+            // Imagine database query here
+            return new List<Order>();
+        }
+    }
+
+    // Helper classes
+    public class User
+    {
+        public int Id { get; set; }
+        public string Name { get; set; }
+        public List<Order> Orders { get; set; }
+    }
+
+    public class Order
+    {
+        public int Id { get; set; }
+        public string Status { get; set; }
+    }
\ No newline at end of file