hi friends

i should do server side validation on two controls
by making use of if condition in aps.net 1.1

i should not use any validation controls instead i should make use of
if..else condition for performing validation..
i have a textbox and a drop down list box..
text box ha new entry
dropdown list box has selected items present in it
now i should write the coding for validating as such user
can enter new one or can select one...

please suggest me the solution for this

regards,
gayathri