Interview Question in Asp.net 3.5


 

Interview Question :: ;first operator; is not a valid identifier

i am reading trough asp.net 3.5 and am doing a try it out exersize. it tells me to give a dropdownbox an id of 1stOperator but it wont let me and says 'first operator' is not a valid identifier. can anyone tell me why this is please.
by ksk