string conn = " Provider = Microsoft.Jet.OLEDB.4.0 ; Data Source =" +FileName + ";Extended Properties=Excel 8.0";
            string Sql = "select  * from [" + Table + "$]" + " where " + Condition + "<> null";
            OleDbConnection thisconnection = new OleDbConnection(conn);
            thisconnection.Open();
            OleDbDataAdapter mycommand = new OleDbDataAdapter(Sql, thisconnection);
             DataSet  ds = new DataSet();
            mycommand.Fill(ds, "[table]");
            thisconnection.Close();