ASP.NET Generic Handler Not Downloading .pptx (PowerPoint) And .pdf Files Properly

Hello,

There was a question raised in the forums as to why the generic handler doesn't download properly PowerPoint and PDF (.ppt/.pdf) files using Firefox but works perfectly using chrome and IE. The solution is to add a content-disposition header and set the ContentType property of context.Response.
VB.NET Code:

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Sub ProcessRequest(ByVal context As HttpContext) Implements IHttpHandler.ProcessRequest Dim documentID As Int32 If Not context.Request.QueryString("documentID") Is Nothing Then documentID = Convert.ToInt32(context.Request.QueryString("documentID")) Else Throw New ArgumentException("No parameter specified") End If Dim strm As Stream = ShowDocument(documentID) context.Response.AddHeader("content-disposition", "attachment; filename=" & fileName.Replace(" ", "_") & ".pptx") context.Response.ContentType = docType If ShowDocument(documentID) Is Nothing Then Else strm = ShowDocument(documentID) Dim buffer As Byte() = New Byte(4095) {} Dim byteSeq As Integer = strm.Read(buffer, 0, 4096) Do While byteSeq > 0 context.Response.OutputStream.Write(buffer, 0, byteSeq) byteSeq = strm.Read(buffer, 0, 4096) Loop End If End Sub