OLEDB Cannot load data from excel after publishing

Question

I am using OLEDb to load table from a local .xls file in C# .Net .
The table is loaded and showed correctly when I view the webpage "View in Browser" . But when I publish, the table is not shown on the webpage (URL that I publish to) but other parts of the webpage are shown correctly.
Is there a reason why the excel file can be loaded when debugging but cannot load when published?
Here is the code in C# that load the Excel:

strConn = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=//Dfs.local/I/Test Copy.xls;Extended Properties='Excel 8.0;HDR=False;IMEX=1'";
OleDbConnection OleConn = new OleDbConnection(strConn);
OleConn.Open();
String sql1 = "SELECT * FROM  [Sheet1$]";
OleDbDataAdapter OleDaExcel1 = new OleDbDataAdapter(sql1, OleConn);

My first idea was that the excel spreadsheet could not be access by webpage. But I have another link on the webpage that would open this excel when clicked. And it's working on the webpage after publishing. Here is the code for the link:

<script language="JavaScript" type="text/javascript"> 
 Out = '<a href="file://Dfs.local/I/Test Copy.xls">Report<\/a>';
 document.writeln(Out);
</script>

I tried many different ways of publishing but could still not load the excel table when opening from URL.

Please help!
Thank you!

Answer 1

1. Local file links only work in Internet Explorer and not Chrome or Firefox.
2. When published, the web server runs under a different UserID than the person looking at the web page. Ensure THAT process has proper access/permissions to the excel output file and directory/share. (Typically this account is called W3SVC.)