gistfile1.cs

// http://stackoverflow.com/questions/4350686/using-plupload-with-asp-net-c

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

using System;
using System.Configuration;
using System.Data;
using System.Data.SqlClient;
using System.IO;
using System.Net;
using System.Web;

public class Upload : IHttpHandler {

    public void ProcessRequest(HttpContext context) {

        /**
         * If 'newTicket' is "false", then the directory to upload to already exists and we can extract it from
         * the 'ticketID' POST parameter.
         * 
         * If 'newTicket' is "true", then this is a new Ticket submission so we need to work with a NEW directory 
         * on the server, so the ID needs to be 1 more than the total number of directories in ~/TicketUploads/
         */
        String newTicket = context.Request["newTicket"] != null ? context.Request["newTicket"] : String.Empty;
        int theID = -1;
        if (newTicket.Equals("true")) {

            // we need to calculate a new ID
            theID = getNewID(context); // calculate the new ID = # of rows
            theID++; // add 1 to make it unique
        } else if (newTicket.Equals("false")) {

            // we can just get the ID from the POST parameter
            theID = context.Request["ticketID"] != null ? Convert.ToInt32(context.Request["ticketID"]) : -1;
        } else {

            // something went wrong with the 'newTicket' POST parameter
            context.Response.ContentType = "text/plain";
            context.Response.Write("Error with 'newTicket' POST parameter.");
        }

        // if theID is negative, something went wrong... can't continue
        if (theID < 0) {
            return;
        }

        // ready to read the files being uploaded and upload them to the correct directory
        int chunk = context.Request["chunk"] != null ? int.Parse(context.Request["chunk"]) : 0;
        string fileName = context.Request["name"] != null ? context.Request["name"] : string.Empty;
        var uploadPath = context.Server.MapPath("~/TicketUploads/" + theID + "/");
        HttpPostedFile fileUpload = context.Request.Files[0];

        // if the NEW directory doesn't exist, create it
        DirectoryInfo di = new DirectoryInfo("" + uploadPath + "");
        if (!(di.Exists)) {
            di.Create();
        }

        using (var fs = new FileStream(Path.Combine(uploadPath, fileName), chunk == 0 ? FileMode.Create : FileMode.Append)) {
            var buffer = new byte[fileUpload.InputStream.Length];
            fileUpload.InputStream.Read(buffer, 0, buffer.Length);
            fs.Write(buffer, 0, buffer.Length);
        }

        context.Response.ContentType = "text/plain";
        context.Response.Write("File uploaded.");
        return;
    }
}