sasan-salem

Hashtable hashtable = new Hashtable();

hashtable.Add("MyFirstKey", 1);
hashtable.Add("MySecondKey", true);

if(hashtable.Contains("MySecondKey")) //it call Equals
    Console.WriteLine("I found it");

sasan-salem

public override bool Equals(object obj)
{
    if (obj is Student student)
    {
        if (student.SerialNo == SerialNo)
            return true;
        else
            return false;
    }
    else

sasan-salem

class Student
{
    public string Name { get; set; }
    public int Number { get; set; }
    public int SerialNo { get; set; }
    public int Grade { get; set; }
}

sasan-salem

namespace DotNet.Controller
{
    public class DummyBytesController : ApiController
    {
        [HttpGet]
        public HttpResponseMessage Get()
        {
            HttpResponseMessage Response;

            string UserAgent = HttpContext.Current.Request.UserAgent;

sasan-salem

<?php
    $userAgent = $_SERVER['HTTP_USER_AGENT'];
    if (strpos($userAgent, 'Instagram')) {
        header('Content-type: application/pdf');
        header('Content-Disposition: inline; filename= blablabla');
        header('Content-Transfer-Encoding: binary');
        header('Accept-Ranges: bytes');
        @readfile($file);
    }
    else{