Download file HttpHandler

public class getfile : IHttpHandler
    {

        public void ProcessRequest(HttpContext context)
        {
            try
            {
                int fileId;
                int.TryParse(context.Request.QueryString[Timeline.Constants.QUERYSTRING_FILEID], out fileId);
                MyFileClass file = new MyFileClass(fileId); //retrieve file info

                context.Response.Clear();
                context.Response.ContentType = "application/octet-stream";

                byte[] fileSize = File.ReadAllBytes(file.PhysicalPath);
                context.Response.AddHeader("Content-Length", fileSize.Length.ToString());
                fileSize = null;
                context.Response.AppendHeader("Content-Disposition", string.Format("attachment;filename={0}", file.Filename));
                context.Response.WriteFile(file.PhysicalPath);
                context.ApplicationInstance.CompleteRequest();
            }
            catch (Exception ex)
            {
                context.Response.Write(ex.Message);
            }

            context.Response.End();
        }

        public bool IsReusable
        {
            get
            {
                return true;
            }
        }
    }

Download file HttpHandler