Check out example codes for "c# 8 null coalescing assignment". It will help you in understanding the concepts better.

Code Example 1

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

Code Example 2

//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

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