using System;

​

public class Program

{

    public static void Main()

    {

            // Same structure with different content...

            var s1 = new StructChar { First = '1', Ref = "1" };

            var s2 = new StructChar { First = '2', Ref = "2" };

            var s3 = new StructChar();

            // All with the same hash code result.

            Console.WriteLine(s1.GetHashCode());

            Console.WriteLine(s2.GetHashCode());

            Console.WriteLine(s3.GetHashCode());        

    }

}

​

struct StructChar

{

    public char First; // But if you change this to an Int32 it works?

    public string Ref;

}

​