pl.help me out on this :
i need to calculate balance amount....however...i am not able to calculate it.
C i have coursefees
then when i click on installment 1 and enter the amount my balance amount textbox should reflect
the coursefees- installment1 total
similarly when i click on installment 2 and enter the amount my balance amt textbox should reflect
the coursefees-inst1-inst2 value
similarly when i click on intallment 3 and enter the amount my balance amt textbox should reflect
the coursefees -inst1-inst2-inst3
however i am getting error as cannot convert string "" to double...! i tired a lot but i am not
getting over this error ! Pl help me out soon !
waiting for quick response!
2) can ne one tell me how to validate email id text box....
eg..if @ sign is missing it should prompt(Invalid email id!)