Is a data structure in a programming language necessarily stored on the stack?

In C#, a struct (struct) is usually placed on the stack if it is a local variable within a method. However, this is not mandatory:

• If the struct is a field of a class (reference type), it is stored on the heap along with the object.
• If the struct is boxed, it is copied to the heap.

Therefore, the placement of a struct in memory depends on the context of its use, not on the struct itself.

Example:

struct Point { public int X, Y; }

void Method() {
    Point p = new Point(); // p is stored on the stack
    MyClass obj = new MyClass();
    obj.PointField = p; // PointField is stored on the heap inside the object
}

class MyClass {
    public Point PointField;
}