有错误：“错误 1 找不到类型或命名空间名称“Graduate”(是否缺少 using 指令或程序集引用?) D:\Backup\我的文档\Visual Studio 2008\Projects\ConsoleApplication2\ConsoleApplication2\Program.cs 77 13 ConsoleApplication2”
这是怎么回事？求救！！！
程序如下：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace student
{
public class Student
{
private string student_id;
private string student_name;
public static string information = "学生上课情况表";
public Student(string id, string name)
{
student_id = id;
student_name = name;
}
public string StudentID
{
get
{
return student_id;
}
set
{
student_id = value;
}
}
public string StudentName
{
get
{
return student_name;
}
set
{
student_name = value;
}
}
public string AddressClass(int i)
{
string CAddress;
if (i == 1)
CAddress = "2#楼";
else
CAddress = "5#楼";
return CAddress;
}
public class Graduate : Student
{
private string teacher_name;
public Graduate(string i, string j, string tn)
: base(i, j)
{
teacher_name = tn;
}
public string TeacherName
{
get
{
return teacher_name;
}
set
{
teacher_name = value;
}
}
}
}
class Program
{
public static void Main(string[] args)
{
Console.WriteLine("{0}", Student.information);
Graduate gs = new Graduate("200201", "wang ming", "zhang yang");
Console.WriteLine("研究生学号:{0}", gs.student_id);
Console.WriteLine("研究生姓名:{0}", gs.student_name);
Console.WriteLine("研究生上课地点:{0}", gs.AddressClass(1));
Console.WriteLine("教师姓名:{0}", gs.teacher_name);
Console.ReadKey();
}
}
}
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