Really odd that I'd get an oledbexception but turns out that the file's handle is still with the original file. I've been searching through google and keep finding the same problem but no solutions.

Connection String:

"Provider=Microsoft.Jet.OLEDB.4.0;" +
"Data Source=" + filePath + ";" +
 "Extended Properties=Excel 8.0;";

Note that it works on every other file except a particular excel file.

Exception:

System.Data.OleDb.OleDbException: No error information available: E_UNEXPECTED(0x8000FFFF).

And then I have exception handling like this:

try {

            IEnumerable<string> worksheetNames = GetWorkbookWorksheetNames(connString);

            DataSet ds;

            foreach (string worksheetName in worksheetNames)
            {
                OleDbDataAdapter dataAdapter =
                    new OleDbDataAdapter("SELECT * FROM [" + worksheetName + "]", connString);

                ds = new DataSet();
                dataAdapter.Fill(ds, "ExcelInfo");
                DataTable dt = ds.Tables["ExcelInfo"];

                entityList.AddRange(GetDataFromDataTable(dt, worksheetName));
            }
        }
        catch (OleDbException ex)
        {                
            File.Move(filePath, filePath + ".invalidFormat.xls");
        }

Has anyone else encountered this behavior? And I'm not sure how to handle an error that keeps the handle on the file I'm supposed to process. It sort of freezes everything in place.