A signed number indicating the relative values of this instance and value.
Less than zero This instance is less than value.
Zero This instance is equal to value.
Greater than zero This instance is greater than value.
-or-
value is null.
Type Reason ArgumentException value is not a ulong and is not a null reference.
Any instance of ulong, regardless of its value, is considered greater than null.
value must be null or an instance of ulong; otherwise, an exception is thrown.