null coalescing operator c#

//the null coalescing operator for c# is ??
int? x = null;
int y = 9;
return x ?? y; 
//Will return the value of x if x is not null else return y

//Return stirng representation of nullable DateTime
DateTime? x = null;
return x.HasValue == true ? x.Value.ToString() : "No Date";

is this condition true ? yes : no

// C# 8 null coalescing assignment operator:
a ??= b;
// the same as:
a = a ?? b;

int? length = people?.Length; // null if people is null