if (extension.Trim() == ".xls")
        {
            // XLS - Excel 2003 and Older
            props["Provider"] = "Microsoft.ACE.OLEDB.12.0;";
            props["Extended Properties"] = "'Excel 8.0;HDR=Yes;IMEX=3'";
            props["Data Source"] = path;
        }
        else
        {
            // XLSX - Excel 2007, 2010, 2012, 2013

            props["Provider"] = "Microsoft.ACE.OLEDB.12.0;";
            props["Extended Properties"] = "'Excel 12.0 XML;HDR=No;IMEX=3;'";
            props["Data Source"] = path;
        }

cmd.CommandText = "SELECT TOP 11000 * FROM [" + sheetName + "]";

System.Data.DataTable dt = new System.Data.DataTable();
dt.TableName = sheetName;
OleDbDataAdapter da = new OleDbDataAdapter(cmd);

da.Fill(dt);