diff --git a/c#/NullPointExceptionValidate b/c#/NullPointExceptionValidate
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+using System;
+
+namespace TestEnum
+{
+    internal class Program
+    {
+        //这段代码是从项目中提取出来的，来自于团队中一个西南交大的女硕士之手
+        //这位女硕士队友喜欢怼天怼地对空气，经常写一些价值千万的代码
+        
+        static void Main(string[] args)
+        {
+            UserBusiness userBusiness = new UserBusiness();
+            User user = userBusiness.GetUserById(1);
+            if (user == null)//嗯，非空判断，挺有心的
+            {
+                //咦？TMD，有非空判断的心，没有非空判断的脑，你这价值千万的代码，合着你判断了个寂寞啊？
+                //写代码前，请确保脑子和手是连上了的
+                Console.WriteLine($"用户名为{user.Name}的用户不存在。");
+            }
+        }
+    }
+
+    class User
+    {
+        private int Id { get; set; }
+        public string Name { get; set; }
+        public string Password { get; set; }
+        public string Email { get; set; }
+    }
+
+    class UserBusiness
+    {
+        public User GetUserById (int id)
+        {
+            User user=null;//从数据库取数据
+            return user;
+        }
+    }
+}