using System;

​

public class student

{

private int _id;

private int _passmark=35;   

private string _name;

 public int id

 {

 set

   {

     if(value<=0)

     {

      throw new Exception("this id is not valid");

     }

     _id=value;

   }

​

 get

  {

   return this._id;

  }

 }

 public int passmark

 {

     get{ return this._passmark;}

 }

 public string name

 {

     set

     {

        if(string.IsNullOrEmpty(value))

          throw new Exception("name can't be null or empty");

         _name=value;

     }

     get

     {

      return this._name;

     }

 }

​

}

​

​

​

public class Program

{

    public static void Main()

    {

        student std=new student();

        std.name="salvi maruf";

        std.id=97;

        Console.WriteLine("name is {0} \nid is {1}",std.name,std.id);

    }

}

​

​

​

​

​

​

​

​