random number generation
we are doing telecom domain.
we have requirement as we have to create random number of length 10 digit .that number should not be repeated.
this is similar like vodafone recharge card.this card has numbers to recharge mobile talk time we are using that 10 digitnumber.how to create taht 10 digit number.if we use random package there may be chance of repeating the number because the number is randomly generated.how to create taht number.