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Saving any kind of object in relational database
class Person{
    string FirstName {get;set;}
    string LastName {get;set;}
}

class Product{
    string Name {get;set;}
    decimal Price {get;set;}
}

CREATE TABLE Data
   (Id int PRIMARY KEY,
    TypeName nvarchar(50),
    PropertyName nvarchar(50),
    PropertyValue binary)

1    Person    FirstName   Jalal

2    Person    LastName    A.R

3    Product   Name        Apple

4    Product   Price       2