Question

int i=1;
long longOne=i; //assignment works fine
//...but
bool canAssign=(typeof(long).IsAssignableFrom(typeof(int))); //false

Why is canAssign false?

Answer 1

When you assign an int to a long, all that happens is implicit conversion. longOne is an actual long (as if you initialized it to be 1L), and not an int masquerading as a long, if you get the drift.

That is, int (or Int32) and long (or Int64) aren’t related in terms of inheritance or implementation; they just happen to be convertible because both are integral number types.