how to removr character from the user inputed string and join to the last of the string in asp.net

Question

i am taking input string from user,
for ex user input "welcome"
now i want to remove this "w" and attach to the last of the string so the newly created word become "elcomew" and i want to do every time user  click on a button in a webpage...  and first character should remove and attached to the last .. can anybody give solution with code...