What is the best way to debug Microsoft Jet Database Engine errors? In my ASP.NET application, I am attempting to connect to an Excel file using impersonation for file security. I can see the file, so I know that part works. When I try to pull data from the file using an OleDBCommand, I get an error.

err.number = 5
err.description "Unspecified error"
err.source = "Microsoft JET Database Engine"

Here is my code:

da.SelectCommand = New System.Data.OleDb.OleDbCommand
conn.ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" & System.Configuration.ConfigurationSettings.AppSettings.Get("CSDPath").ToString & ";Extended Properties=""Excel 8.0;HDR=No;IMEX=1"""

da.SelectCommand.CommandText = "SELECT * FROM [Sheet1$]"
da.SelectCommand.CommandType = CommandType.Text
da.SelectCommand.Connection = conn
da.Fill(ds, "CSD Rates")