C#中using System.Diagnostics;怎么产生如题

C#中using System.Diagnostics;怎么产生如题 关于c# using systemusing System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Text;using System.Windows.Forms; c#中system.math. c#高手看看什么问题 using System; using System.Collections.Generic; using System.ComponentModel; usiusing System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Text;using System 求0-100所有的质数用c#编写using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Text;using System.Windows.Forms;namespace WindowsApplication2{ public partial class For c_sharp中using system.linq表示什么? using System; using System.Data; using System.Configuration; using System.Linq; using System.Web; u提示“system”中不存在类型或命名空间名称‘Ling’（缺少程序集引用吗?） using System; using System.Collections.Generic; using System.Linq; using System.Text; using System. 在c#中 System.Console.WriteLine什么意思? C# system是什么程序 using System; using System.Collections; using System.Configuration; using System.Data; using System.using System;using System.Collections;using System.Configuration;using System.Data;using System.Linq;using System.Web;using System.Web.Security;using c# 问题 注释怎么写using System;using System.Collections.Generic;using System.Text;namespace ConsoleApplication1{ class Program { static void Main(string[] args) { ComplexNumber x, y; Console.Write(Ent matlab中diag（diag(a))什么意思 matlab中diag用法 matlab中 diag(1 ./ using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace Cons using System.Linq using System; using System.Collections; using System.ComponentModel; using System.Data; using System.Drawing; using System.Web; using System.Web.SessionState; using System.Web.UI; using System.Web.UI.WebControls; using System.Web.UI.HtmlControls; usi