Returns a new DateTime that adds the specified number of milliseconds to the value of this instance.
An object whose value is the sum of the date and time represented by this instance and the number of milliseconds represented by value.
Type Reason ArgumentOutOfRangeException The resulting DateTime is less than DateTime.MinValue or greater than DateTime.MaxValue.
This method does not change the value of this DateTime. Instead, it returns a new DateTime whose value is the result of this operation.
The fractional part of value is the fractional part of a millisecond. For example, 4.5 is equivalent to 4 milliseconds and 5000 ticks, where one millisecond = 10000 ticks.
The value parameter is rounded to the nearest integer.