C# Comparison of two arrays, remove the duplicate part, and return the implementation of non-duplicate part

Examples are as follows:

List<string> Ashuzu = new List<string>();
 ("1"); 
("2"); 
("3");
 List<string> Bshuzu = new List<string>();
 ("1"); 
("2"); 
("4");
 List<string> Cshuzu = new List<string>();
 foreach (string aitem in Ashuzu)
 {
   if (!(aitem))
   {
     (aitem);
   }
 }

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