"Excel2003ConString" connectionString="Provider=Microsoft.Jet.OLEDB.4.0;Data Source={0}; Extended Properties='Excel 8.0;HDR={1}'"
   "Excel2007ConString" connectionString="Provider=Microsoft.ACE.OLEDB.12.0;Data Source={0}; Extended Properties='Excel 12.0;HDR={1}'"
   "CSVConString"  connectionString="Provider=Microsoft.Jet.OleDb.4.0; Data Source={0};Extended Properties='Text;HDR=YES;FMT=Delimited'"

<httpRuntime maxRequestLength="1048576" enableVersionHeader="false" requestValidationMode="2.0" executionTimeout="1200"/>
    <security>
  <requestFiltering>
    <requestLimits maxAllowedContentLength="1048576000"></requestLimits>
  </requestFiltering>
</security>