System Namespace
Represents a 64-bit unsigned integer.
The UInt64 value type represents unsigned integers with values ranging from 0 to 184,467,440,737,095,551,615.
UInt64 provides methods to compare instances of this type, convert the value of an instance to its String representation, and convert the String representation of a number to an instance of this type.
NOTE: The UInt64 type is not CLS-compliant. The CLS-compliant alternative type is Decimal. Int64 can be used when the original value is less than half of UInt64.MaxValue.
For information about how format specification codes control the String representation of value types, see Formatting Base Types.
This type implements interfaces IComparable, IFormattable, and IConvertible. Use the Convert class for conversions instead of this type's explicit interface member implementation of IConvertible.
CAUTION: Assigning a 64-bit value on a 32-bit Intel computer is not an atomic operation; that is, the operation is not threadsafe. This means that if two people simultaneously assign a value to a static UInt64 field, the final value of the field cannot be predicted.
Int64