Download Images from URL

Question

I want to save images to memory 50 images
My software processing ----
1. Download Image from URL every 60 secs and all downloaded images have time to use 15 mins
2. When download image done save images to memory
3. Then show images in picturebox
4. When user click button get next image form memory and delete old image from memory
5. If what images not use in 15 mins auto delete from memory
Help me ... Thank you a lot 

Answer 1

Ok chechk the below method/Events that will download 50 image and fill a List<image> object into memory, you need to add a picturebox1 and button1 to your form, I used my profile pic here on msdn the link you've send didn't work:
//Global Variables
List<Image> li = new List<Image>();
int second = 0; //Form Initaile
public Captcha()
InitializeComponent();
//Async download event
private void ReadCallback(IAsyncResult asynchronousResult)
HttpWebRequest request = (HttpWebRequest)asynchronousResult.AsyncState;
HttpWebResponse response = (HttpWebResponse)request.EndGetResponse(asynchronousResult);
using (StreamReader streamReader1 = new StreamReader(response.GetResponseStream()))
li.Add(Image.FromStream(streamReader1.BaseStream));
pictureBox1.Image = li[0];
//Download Method for 50 images
private void DownLoadImages()
try
for (int i = 0; i <= 50; i++)
HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(new Uri("https://i1.social.s-msft.com/profile/u/avatar.jpg?displayname=fouad%20roumieh&size=extralarge&version=00000000-0000-0000-0000-000000000000"));
request.BeginGetResponse(new AsyncCallback(ReadCallback), request);
catch (WebException ex)
//Form Load
private void Captcha_Load(object sender, EventArgs e)
DownLoadImages();
And here on button click event we remove element and show the next one into picture box, and if used up all image we call the async download messages again to get a new list of images:
private void button1_Click(object sender, EventArgs e)
li.RemoveAt(0);
if (li.Count > 0)
{ //Show next
pictureBox1.Image = li[0];
else
DownLoadImages();
Also here a timer event I didn't enable but you can enable to check for the 15 mins and destroy the images list if passed:
private void timer1_Tick(object sender, EventArgs e)
second = second + 1;
int minutes = second / 60;
if (minutes >= 15)
li.Clear();
//Call downloadimages or else...
Fouad Roumieh