Convert Integer yo 8 digit number by prefixing leading zeros (00000012) using C#

Sir,

need to generate 8 digit unique id on every button click. As every time data saved to database   a 8 digit unique id will generate and save to database. Id should starts from 00000001 and goes on by incrementing 1. No two id's would be same. 

eg :

00000001

00000002

.

.

.

00000009

00000010

00000011

in this way.... any suggestion would be helpfull....