How to map the foreign key in my model class using MVC

Question

I have two tables like below 

Table_ID	Course_Category_ID	Course_Category_NAme
1	1	Basic Sciences

 

and The Course Main Table in which this category ID would be a foreign key  

Table_ID	Course_Category_ID(F)	Course_ID	Course_Name
1	1	1	Math
2	1	2	Physics

 

how to write a model class where course category_ID is foreign key