Why does 0L not equal 0 when cast to an object?

Question

I don't think I understand why the first statement evaluates to true and the last statement evaluates to false, but it's been a long day.

Can somebody explain it?

0L.Equals(0) // true
((object)0L).Equals(0L) // true
((object)0L).Equals(0) // false

Answer 1

Object.Equals first compares the types if the object is a value type which it is. Both are different in this case.

MSDN:

If the current instance is a value type, the Equals(Object) method tests for value equality. Value equality means the following: The two objects are of the same type. As the following example shows, a Byte object that has a value of 12 does not equal an Int32 object that has a value of 12, because the two objects have different run-time types.