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Editorial Team
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Asked: 2026-05-12T16:57:56+00:00

First of all I am making it clear that, I am not using any

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First of all I am making it clear that, I am not using any OR Mapper framework to solve this problem, coz I need to understand the model from the ground up.

OK. Let’s see the table designs:

Course – table

------------------
 ID | CourseName
------------------
 1  |  C++
 2  |  Java
------------------

Teacher – table

-----------------------
 ID |   TeacherName
-----------------------
 1  |   Professor X
 2  |   Professor Y  
-----------------------

CourseTeacher – table

---------------------------------------------
 ID | CourseID | TeacherID | ClassTime
---------------------------------------------
 1  |   1      |     1     | Monday    10:55
 2  |   1      |     2     | Thursday  10:55
 3  |   2      |     1     | Tuesday   11:45
 4  |   2      |     2     | Wednesday 11:45
---------------------------------------------

How should I design my classes in C#?

There can be another problem like is:

User – table

------------------
 ID | UserName
------------------
 1  |  a
 2  |  b
------------------

Role – table

-----------------------
 ID |   RoleName
-----------------------
 1  |   c
 2  |   d
-----------------------

UserRole – table

---------------------------------------------
 ID | UserID | RoleID | Remarks
---------------------------------------------
 1  |   1      |     1     | xy
 2  |   1      |     2     | yz
 3  |   2      |     1     | zx
 4  |   2      |     2     | xx
---------------------------------------------
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1 Answer

  1. Editorial Team

    In general, when you have a many-to-many relationship in your domain model, the access patterns in your code will either be from one side of the M2M or from the other…

    For e.g. If you have a structure containing people, each of whom has made a number of purchases at your retail outlets, you might as a rule want to access those transactions thrpugh a person, not through the product. in other words, you might more often want to know what products a specific person purchased, not what people purchased a specific product. So in this example you would simply have each person class contain a property which is a collection of products. There would be no need to access the person class through the Product class.

    Another e.g. If you have a a structure containing people, each of whom subscribes to a number of magazines.

    Now if you are the publisher, you might as a rule want to access those transactions through the magazine, not through the person. in other words, you would much more often want to know what people subscribe to a specific magazine, not what magazines a specific person subscribes to. So in this example you would put a Subscribers collection property in the Magazine class.

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