Datagridview in line edit c#

suppose i am showing employee id, name, city and salary by Datagridview. in the last column i have a button called edit.

so i want when user click on edit button then in that row text boxes will dynamically placed and enable user to edit name, salary and a dropdown will come to enable user to change city. so just tell me how to achieve this.

if possible discuss with code sample. thanks