using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.IO;
using System.Net.Mail;
using System.Text;

public partial class WebBrowser : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        ArrayList viewFile = (ArrayList)Session["viewFile"];
        if (!IsPostBack)
        {
            string path = Request.MapPath("Images");

            if (Directory.Exists(path))
            {
                DirectoryInfo di = new DirectoryInfo(path);
                FileInfo[] rgFiles = di.GetFiles("*.jpg");
                foreach (FileInfo fi in rgFiles)
                {
                    viewFile.Add(fi.Name);
                }
                ViewState.Add("SelectedOne", 0);
            }
            else
            {
                Directory.CreateDirectory(path);
            }
        }
        Session["viewFile"] = viewFile;
    }


    public void Display()
    {
        // displays the first image in the array list
        ArrayList viewFile = (ArrayList)Session["viewFile"];
     
        int index = Convert.ToInt32(ViewState["SelectedOne"]);
        this.boxPic.ImageUrl = "Images/" + viewFile[index];
        this.Download.NavigateUrl = "Images/" + viewFile[index];
    }
    protected void btnNext_Click(object sender, EventArgs e)
    {
        ArrayList viewFile = (ArrayList)Session["viewFile"];
        int index = Convert.ToInt32(ViewState["SelectedOne"]);
       // int index = int.Parse(ViewState["SelectedOne"]);
      
        if (index+1 > viewFile.Count -1)
        {
            index = 0;
        }
            index++;
        ViewState["SelectedOne"] = index;
        this.Display();
    }
    protected void btnPrevious_Click(object sender, EventArgs e)
    {
        ArrayList viewFile = (ArrayList)Session["viewFile"];
        int index = Convert.ToInt32(ViewState["SelectedOne"]);
        if (index-- <=0)
        {
            index = viewFile.Count-1;
        }
        index--;
        ViewState["SelectedOne"] = index;
        this.Display();
    }
    protected void btnUpload_Click(object sender, EventArgs e)
    {
        // Specify the path on the server to
        // save the uploaded file to.
        String savePath = "Images";

        // Before attempting to perform operations
        // on the file, verify that the FileUpload 
        // control contains a file.
        if (txtBrowse.HasFile)
        {
            // Get the name of the file to upload.
            String fileName = txtBrowse.FileName;

            // Append the name of the file to upload to the path.
            savePath += fileName;


            // Call the SaveAs method to save the 
            // uploaded file to the specified path.
            // This example does not perform all
            // the necessary error checking.               
            // If a file with the same name
            // already exists in the specified path,  
            // the uploaded file overwrites it.
            txtBrowse.SaveAs(savePath);

            // Notify the user of the name of the file
            // was saved under.
            lblBrowse.Text = "Your file was saved as " + fileName;
        }
        else
        {
            // Notify the user that a file was not uploaded.
            lblBrowse.Text = "You did not specify a file to upload.";
        }
    }
}