How do you implement GetHashCode for structure with two string, when both strings are interchangeable

Question

I have a structure in C#:

public struct UserInfo
{
   public string str1
   {
     get;
     set;
   }

   public string str2
   {
     get;
     set;
   }           


        

Answer 1

Sort them, then concatenate them:

return ((str1.CompareTo(str2) < 1) ? str1 + str2 : str2 + str1)
    .GetHashCode();