C# check if value is nul question mark code example

Example 1: 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

Example 2: c# question mark

FileInfo fi = ...; // fi could be null
long? length = fi?.Length; // If fi is null, length will be null