Ex, C# - rextester

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//Rextester.Program.Main is the entry point for your code. Don't change it.
//Microsoft (R) Visual C# Compiler version 2.9.0.63208 (958f2354)

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text.RegularExpressions;
using System.Xml;
using System.Xml.Serialization;

namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {
            var student = new Student()
            {
                Name = "Max power",
                Email = "test999@email.com",
                Department = "Science",
                Topics = new Topic[]
                {
                    new Topic() { TopicName = "CAGLENN_17" }
                }
            };
            
            var s = SerializeObject(student);
            Console.WriteLine(s);
        }
    
        public static string SerializeObject<T>(T toSerialize)
        {
            XmlSerializer xmlSerializer = new XmlSerializer(toSerialize.GetType());

using(StringWriter textWriter = new StringWriter())
            {
                xmlSerializer.Serialize(textWriter, toSerialize);
                return textWriter.ToString();
            }
        }
    }
    
    [XmlRoot(ElementName = "student")]
    public class Student
    {
        [XmlElement(ElementName = "name")]
        public string Name { get; set; }

[XmlElement(ElementName = "email")]
        public string Email { get; set; }

[XmlIgnoreAttribute]
        public string Department { get; set; }

[XmlArray(ElementName = "topics")]
        public Topic[] Topics { get; set; }
    }

[XmlType(TypeName = "topic")]
    public class Topic
    {
        [XmlElement(ElementName = "topiccode")]
        public string TopicName;
    }
}

Show compiler warnings [ + ] Show input
Compilation time: 0,23 sec, absolute running time: 0,77 sec, cpu time: 0,77 sec, average memory usage: 28 Mb, average nr of threads: 7, absolute service time: 1,02 sec