public class Course

{

public int CourseId { get; set;}

​

public string Title {get; set;}

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public int Credit {get; set;}

​

​

public Department Department {get; set;}

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public Intructor Intructor {get; set;}

​

}

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public class Enrollment

​

{

​

public int EnrollmentId { get; set;}

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public int Grade { get; set;}

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public Student Students{get; set;}

​

}

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public class Student

​

{

​

public int StudentId { get; set;}

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public string LastName{get; set;}

​

public string FirstName {get; set;}

​

​

}

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public class Department

​

{

​

public int DepartmentId { get; set;}

​

public string Name {get; set;}

​

public decimal Budget {get; set;}

​

​

​

}

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public class Intructor

​

{

​

public int InstructorId { get; set;}

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public string FirstName {get; set;}

​

public string LastName {get; set;}

​

​

public OfficeAssign Assign {get; set;}

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}

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public class OfficeAssign

​

{

​

public int AssignId {get; set; }

​

public string Location {get; set;}

​

}