how to get Linkbutton's text to string type in it's Click

Question

i am posting the question in gridview ... while posting, question will get converted from textbox text to linkbutton control in the gridview in the button click event

upto this i have got what i want but  

i am not able to fetch the LinkButton text in string type to post the again same question on top of its child page and view it's replies alone under the same page

doing ASP.net C# 2.0