ashx file download, causing problem in firefox

Created a ashx page, which is called like

<a href="AttachmentHandler.ashx?id=2">download</a>

On IE it is working fine, but on firefox for some type of file(doc/xslx etc) it currupt the file, like change in size. i tried to use encodeing/charset options but it is not working

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

using System;
using System.Web;


public class AttachmentHandler : IHttpHandler, System.Web.SessionState.IReadOnlySessionState{

    public void ProcessRequest(HttpContext context)
    {
        try
        {
            string attachmentId = context.Request["Id"];

            if (!string.IsNullOrEmpty(attachmentId))
            {
                Attachment attachmentEntity = AttachmentProvider.GetById(Convert.ToInt32(attachmentId));
                if (attachmentEntity != null)
                {
                    context.Response.Clear();
                    //context.Response.ClearHeaders();

                    //context.Response.ContentEncoding = System.Text.Encoding.UTF8;
                    //context.Response.Charset = System.Text.Encoding.UTF8.WebName;

                    //context.Response.Cache.SetCacheability(HttpCacheability.NoCache);

                    context.Response.Buffer = false;
                    context.Response.ContentType = attachmentEntity.AttachmentType;
                    context.Response.AppendHeader("Content-Disposition", "attachment; filename=\"" + attachmentEntity.Name + "\"");
                    context.Response.BinaryWrite(attachmentEntity.AttachmentFile);
                    context.Response.Flush();
                    context.Response.Close();
                }
            }
            else
            {
                context.Response.Clear();
                context.Response.ClearHeaders();
                context.Response.ContentType = "text/plain";
                context.Response.Write(Resources.GlobalResource.ErrorMessageUnableAttachements);
            }
        }
        catch (Exception ex)
        {
            IQity.Fusion.Utility.LoggingUtility.IQityErrorLogger.HandleException(ex);
            context.Response.Clear();
            context.Response.ClearHeaders();
            context.Respo开发者_开发技巧nse.ContentType = "text/plain";
            context.Response.Write(Resources.GlobalResource.ErrorMessageUnableAttachements);
        }
    }

    public bool IsReusable {
        get {
            return false;
        }
    }

}

Add

context.Response.ContentType

in your this code and ur error will resolved...

if (attachmentEntity != null)
            {
                context.Response.Clear();
                //context.Response.ClearHeaders();

                //context.Response.ContentEncoding = System.Text.Encoding.UTF8;
                //context.Response.Charset = System.Text.Encoding.UTF8.WebName;

                //context.Response.Cache.SetCacheability(HttpCacheability.NoCache);

                context.Response.Buffer = false;
                context.Response.ContentType = attachmentEntity.AttachmentType;
                context.Response.AppendHeader("Content-Disposition", "attachment; filename=\"" + attachmentEntity.Name + "\"");
                context.Response.BinaryWrite(attachmentEntity.AttachmentFile);
                context.Response.Flush();
                context.Response.Close();
            }

I don't think you are supposed to call this: context.Response.Close();

The last time I had to code something similar :

context.Response.Clear();
context.Response.ContentType = attachmentEntity.AttachmentType;
context.Response.AppendHeader("Content-Disposition", "attachment; filename=\"" + attachmentEntity.Name + "\"");
context.Response.BinaryWrite(attachmentEntity.AttachmentFile);
context.Response.End();

and it works with FF... maybe the .Flush() is closing the stream a little too earlier...

One other thing I noticed : I use a piece of code to tell what is the ContentType.. and for Msword, I get application/unknown but seems to work fine anyway..

.docx is not application/msword. It's application/vnd.openxmlformats-officedocument.wordprocessingml.document.

Check you're using the right MIME type for .docX and .xslX files.