Q: Text to Speech in ASP.NET - Access is denied... what to do? On my personal website, i would like to make it "pronounce" something
I solved the "concept" problem, as in here, and on my desktop it works smoothly when launched from visual web developer. Creates a file, and then an embedded player in the page will play it. Perfect.
So, I uploaded it on the server... I get this error 500:

Server Error in '/sapi' Application.
  Access is denied. (Exception from
  HRESULT: 0x80070005 (E_ACCESSDENIED))
  Description: An unhandled exception
  occurred during the execution of the
  current web request. Please review the
  stack trace for more information about
  the error and where it originated in
  the code.
Exception Details:
  System.UnauthorizedAccessException:
  Access is denied. (Exception from
  HRESULT: 0x80070005 (E_ACCESSDENIED))
ASP.NET is not authorized to access
  the requested resource. Consider
  granting access rights to the resource
  to the ASP.NET request identity.
  ASP.NET has a base process identity
  (typically {MACHINE}\ASPNET on IIS 5
  or Network Service on IIS 6) that is
  used if the application is not
  impersonating. If the application is
  impersonating via , the identity
  will be the anonymous user (typically
  IUSR_MACHINENAME) or the authenticated
  request user.
(...)
Source Error:
See it below
Source File:
  c:\mypath\sapi\myfile.aspx.cs
  Line: 21
Stack Trace:
[UnauthorizedAccessException: Access
  is denied. (Exception from HRESULT:
  0x80070005 (E_ACCESSDENIED))]
  SpeechLib.SpVoiceClass.Speak(String
  Text, SpeechVoiceSpeakFlags Flags) +0 
  prova.Button1_Click(Object sender,
  EventArgs e) in
  c:\mypath\sapi\prova.aspx.cs:21
  System.Web.UI.WebControls.Button.OnClick(EventArgs
  e) +111
  System.Web.UI.WebControls.Button.RaisePostBackEvent(String
  eventArgument) +110
  System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String
  eventArgument) +10
  System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler
  sourceControl, String eventArgument)
  +13    System.Web.UI.Page.RaisePostBackEvent(NameValueCollection
  postData) +36
  System.Web.UI.Page.ProcessRequestMain(Boolean
  includeStagesBeforeAsyncPoint, Boolean
  includeStagesAfterAsyncPoint) +1565
Version Information: Microsoft .NET
  Framework Version:2.0.50727.3053;
  ASP.NET Version:2.0.50727.3053

This is the source
Source Error:
Line 19: myfile.Open(@"C:\mypath\sapi\gen\hi.wav",SpeechStreamFileMode.SSFMCreateForWrite,false);

Line 20: voice.AudioOutputStream = myfile;

Line 21: voice.Speak("Hi",SpeechVoiceSpeakFlags.SVSFDefault);
I get error on line 21, Voice.speak
That probably means that the aspnet worker user has not some right permission
The generation folder has all the right permissions: an empty file is created.
So, i have to give permission of execute to some system dll?
Do you know which dll? It is not bin\Interop.SpeechLib.dll, on this one the aspnet user has full control
Ps: i have full control on the (windows) server (i mean, access by RDC, is not a shared hosting)

A: I got it working by setting the AppPool as working as "Local System" and by setting in the machine.config to work as SYSTEM account
Of course i feel that as a security issue, as i am hosting my personal website on the (small) company server (Employees are explicitly authorized to do so by the company owner)
Maybe this is not a good solution?
I set this setting only for this webapp, and i am not so good at coding (so there are lots of bugs in my code, measured in 100 WTFs/minute (haha)

A: I have had similar problems, after many headaches i did manage to solve the issue with me. I found two problems the first being the browser, i found for my purpose only ie explorer would work and not other browsers such as mozilla. The second problem was finally the permissions, even though i had all permissions correctly i found that i had to remove the internet user permission and check the log on as local account option which then worked. 
