how to use validations in iphone
<p>i am new developer on iphone,i don't know how to use validations in iphone,my requirement is in .Xib file Take 4textfields(username,password,confirmpassword,Age) and Click button. with out enter the data in textfields click the button validations will work and diaplay  msg like You have to enter username,password,conformpasswor,Age and password and conformpassword textfields must match.Any one know about this please help to me.</p>
