ASP.NET OLEDB code breaks when deployed on IIS7

I'm trying to write a simple website (ASP.NET v4), which will call Windows Search, find a specific file and return it to the user. I've put together the following as an example: it calls the Windows Search service on "remoteserver", and returns the path of "somefile.txt":

OleDbConnection conn = new OleDbConnection();

conn.ConnectionString = "Provider=Search.CollatorDSO;Extended Properties='Application=Windows';";

OleDbCommand cmd = conn.CreateCommand();


cmd.CommandText = string.Format(
            "SELECT System.ItemPathDisplay, System.ItemType FROM " +
            " sytelhp.systemindex WHERE SCOPE='file://remoteserver/archive' AND CONTAINS(\"System.FileName\", " +
            " '\"*{0}*\"')", "somefile.txt");


conn.Open();

OleDbDataReader rdr = cmd.ExecuteReader();

string result=rdr[0].ToString();

.. and this works great on Visual Studio 2010 development environment, "result" contains the path to the file. However, if I deploy it to the local IIS7 server (running on Server 2008), I get this error:

The parameter is incorrect. 
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.Data.OleDb.OleDbException: The parameter is incorrect.

I'm at a loss where to go next. What do I need to do to IIS7, or the code, or both to get it wo开发者_StackOverflow中文版rking? Again, this works fine within VS2010 (tested on both Windows 7 and Windows 2008 Server).

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I guess you are running on Vista or older OS and the IIS runs on 2008 Server or newer? Try Provider=Search.CollatorDSO.1 (note the .1).

Edit: You should use a different user account for the search to work (not the default "network service" one the asp.net app runs under). See the comments for more info.