C# List Assigned Values

Hello Experts,

I have an issue with C# List, when I add values it showing the duplicates data.

using System;
using System.Collections.Generic;

public class Program
{
	public static void Main()
	{
		Student std = new Student();
		List<Student> studentList = new List<Student>();
		
		std.ID = 1;
		std.Name = "John";
		studentList.Add(std);
		
		
		std.ID = 2;
		std.Name = "Doe";
		studentList.Add(std);	
		
		
		Console.WriteLine(studentList.Count);//count
		
		Console.WriteLine(studentList[0].ID); //ID
		Console.WriteLine(studentList[0].Name); //Name
	}
}

public class Student
{ 
	public int ID { get; set; }
	public string Name { get; set; }
}

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Output:
2
2
Doe

The count was correct, but I was expecting below output and the list shows duplicates:

2 -- >Count
1 --> ID
John -- > Name

Please help, what I was doing incorrect.

Thanks,
ASPDEV