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+====== null_string ======
+The behavior of a string variable with a null_string value is defined by the /vo2 compiler option:
+With /vo2+ NULL_STRING is translated to String.Empty
+Without /vo2 NULL_STRING is translated to NULL
+Calling the :ToString() method on a variable that has a null_string value throws an exception if the code is compiled without the /vo2 option.
+Source: [[https://www.xsharp.info/forum/private-product/1392-null-string-and-the-x-runtime#10210|https://www.xsharp.info/forum/private-product/1392-null-string-and-the-x-runtime#10210]]