get null stream

Question

   Assembly executingAssembly = Assembly.GetExecutingAssembly();
            Assembly assembly_ = Assembly.GetCallingAssembly(); 
            Class84.int_0 |= (num ^ 2114063710) - num2;
            Assembly assembly = executingAssembly;

          
 
            StringBuilder stringBuilder = new System.Text.StringBuilder ();
            int num3 = -1604370718 - num ^ num2;
            stringBuilder.Append((char)(num3 >> 16)).Append((char)num3);
            num3 = (1578876631 ^ num) - num2;
            stringBuilder.Append((char)(num3 >> 16)).Append((char)num3);
            num3 = 1846979900 - num + num2;
            stringBuilder.Append((char)num3).Append((char)(num3 >> 16));
            num3 = -772500791 + num - num2;
            stringBuilder.Append((char)num3).Append((char)(num3 >> 16));
            num3 = (-1604370723 - num ^ num2);
            stringBuilder.Append((char)num3).Append((char)(num3 >> 16));
            num3 = (1578221265 ^ num) - num2;
            stringBuilder.Append((char)(num3 >> 16)).Append((char)num3);
            num3 = 1847569726 - num + num2;
            stringBuilder.Append((char)num3).Append((char)(num3 >> 16));

        
   
            Stream manifestResourceStream = assembly.GetManifestResourceStream(stringBuilder.ToString());