Syntax

• X?.Y; // null if X is null else X.Y
• X?.Y?.Z; // null if X is null or Y is null else X.Y.Z
• X?[index]; // null if X is null else X[index]
• X?.ValueMethod(); // null if X is null else the result of X.ValueMethod();
• X?.VoidMethod(); // do nothing if X is null else call X.VoidMethod();

Remarks

Note that when using the null coalescing operator on a value type T you will get a Nullable<T> back.