While he can act, sing, dance and be the ' Sultan' of Bollywood, there's one thing that Salman Khan feels he just cannot do. Present at the book launch of yesteryear's female superstar Asha Parekh, the 51-year-old said that he thinks that it's like the bravest thing for anyone to write their own biography and he can never do this in his whole life. Salman, who was extremely 'pleased' to be present at the event, said that everyone must buy the book because the generation that she belongs to, has lived the cleanest life ever; both professionally and personally. So, it will be a book of values and principles. It will be interesting to know that Dabangg Khan had written the foreword for the book which has been penned by veteran film critic Khalid Mohamed. Also present at the launch were superstars Dharmendra and Jeetendra.