int? MyNullableIntA = 2;
int? MyNullableIntB = null;
int? MyNullableIntC = null;
bool MyBool1, MyBool2, MyBool3, MyBool4, MyBool5, MyBool6;

MyBool1 = MyNullableIntA == MyNullableIntB;
MyBool2 = (MyNullableIntA - MyNullableIntB) == 0;

MyBool3 = MyNullableIntB == MyNullableIntC;
MyBool4 = (MyNullableIntB - MyNullableIntC) == 0;

MyBool5 = (MyNullableIntB - MyNullableIntC) == null;
MyBool6 = (MyNullableIntA - MyNullableIntB) == null;