Upload and Show Profile Picture Based on Session ID in ASP.NET

This was a question asked to in asp.net forums. It asked How to Upload and Show Profile Picture Based on Session ID in ASP.NET. I found it interesting and thought to write a post for it. So here we are with the solution:

FileUpload.aspx

<form id="form1" runat="server">

<div>

    <asp:FileUpload ID="FileUploadControl" runat="server" />

    <asp:Button runat="server" ID="UploadButton" Text="Upload" OnClick="UploadButton_Click" />

    <asp:Image ID="ProfilePic" runat="server" Height="150px" Width="150px" />

    <br />

    <br />

    <asp:Label runat="server" ID="StatusLabel" Text="Upload status: " />

</div>

</form>

FileUpload.aspx.cs

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

public partial class FileUpload : System.Web.UI.Page

{

    protected void Page_Load(object sender, EventArgs e)

    {

        if (Session["UserSessionID"] == null)

            Session["UserSessionID"] = System.Guid.NewGuid().ToString();//probably  create this in global.asax in OnSessionStart event

        ProfilePic.ImageUrl = "HttpHandler.ashx?ID=" + Session["UserSessionID"].ToString();

    }

    protected void UploadButton_Click(object sender, EventArgs e)

    {

        if (FileUploadControl.HasFile)

        {

            try

            {

                string ext = System.IO.Path.GetExtension(FileUploadControl.PostedFile.FileName);

                Session["UserSessionID"] = Session["UserSessionID"] + ext;

                FileUploadControl.SaveAs(Server.MapPath("~/") + Session["UserSessionID"]);

                StatusLabel.Text = "Upload status: File uploaded!";

                ProfilePic.ImageUrl = "HttpHandler.ashx?ID=" + Session["UserSessionID"].ToString();

            }

            catch (Exception ex)

            {

                StatusLabel.Text = "Upload status: The file could not be uploaded. The following error occured: " + ex.Message;

            }

        }

    }

}

HttpHandler.ashx

<%@ WebHandler Language="C#" Class="HttpHandler" %>

using System;

using System.Web;

public class HttpHandler : IHttpHandler {

    public void ProcessRequest(HttpContext context)

    {

        string imagePath = context.Request.QueryString["ID"];

        // split the string on periods and read the last element, this is to ensure we have

        // the right ContentType if the file is named something like "image1.jpg.png"

        System.IO.FileInfo imageFile = new System.IO.FileInfo(context.Request.PhysicalApplicationPath + imagePath); 

        bool fileExists = imageFile.Exists;

        if (fileExists)

        {

            context.Response.ContentType = "image/" + imageFile.Extension;

            context.Response.WriteFile(context.Server.MapPath(imagePath));

        }

        else

        {

            context.Response.ContentType = "image/jpeg";

            context.Response.WriteFile(context.Server.MapPath("NoImage.jpg"));

        }

       

            context.Response.Write(imagePath);

       

    }

    public bool IsReusable

    {

        get { return true; }

    }

}