public class Person
    {      
        public Person()
        {
            personId= this.GetType().Name + (new Random()).Next(1, int.MaxValue);          
        }
     }

var student1=new Student(){Name="Iraj",Age=21};
var student1=new Student(){Name="Nima",Age=20};
var student1=new Student(){Name="Sara",Age=25};
var student1=new Student(){Name="Mina",Age=22};
var student1=new Student(){Name="Narges",Age=26};
var teacher1=new Student(){Name="Navaei",Age=45};
var teacher2=new Student(){Name="Imani",Age=50};

 public class Person
    {      
        public Person()
        {
            personId= this.GetType().Name + (new Random()).Next(1, int.MaxValue);  
            Debug.Print(personId)       
        }
     }

using System;
using System.Threading;

public static class RandomProvider
{    
    private static int seed = Environment.TickCount;

    private static ThreadLocal<Random> randomWrapper = new ThreadLocal<Random>(() =>
        new Random(Interlocked.Increment(ref seed))
    );

    public static Random GetThreadRandom()
    {
        return randomWrapper.Value;
    }
}