Synchronization of old projects

Part1

C#入门/Lesson11_字符串拼接练习/Lesson11_字符串拼接练习.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

C#入门/Lesson11_字符串拼接练习/Program.cs

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+using System;
+namespace Lessson11_exercise
+{
+    class program
+    {
+        static void Main(string[] args)
+        {
+            string customerName = "张三";
+            Console.WriteLine("你好，{0}",customerName);
+            Console.WriteLine();
+
+            string customerName2 = "李四";
+            int customerAge = 25;
+            Console.WriteLine("{0}今年{1}岁了\n", customerName2,customerAge);
+
+            string name = "小明";
+            int age = 20;
+            string email = "123@gmail.com";
+            string address = "北京市朝阳区某街道某小区";
+            string phone = "12345678901";
+            Console.WriteLine("姓名：{0}\n年龄：{1}\n邮箱：{2}\n地址：{3}\n电话：{4}\n", name, age, email, address, phone);
+
+            string username;
+            int age1;
+            string classes;
+            Console.WriteLine("请输入你的用户名:");
+            username = Console.ReadLine();
+            Console.WriteLine("请输入你的年龄:");
+            age1 = Convert.ToInt32(Console.ReadLine());
+            Console.WriteLine("请输入你的班级:");
+            classes = Console.ReadLine();
+            Console.WriteLine("你是{0}\n你今年{1}岁了\n班级是{2}\n",username,age1,classes);
+        }
+    }
+}