i have an excel source to a data base but before i transmit the information in the column product-name i have to verify if the information is a string without numbers in it(example:lion is correct but lion124 is wrong) , using conditional split and after the verification i have to send a message in an excel file telling the user that the column that he wrote is not correct and if it is correct i will send it to the data base how could i check for the column and how can i send a excel file ?