Maintain HTML TextBox value in Master Page using C# in ASP.Net

if i used <div></div> values can't save 

if i used <table></table> values can be saved but whole css design will be changed

i used two things:-

(1)

TextBox tbSearch = (TextBox)this.FindControl("txtSearch");
(2)
Request.form["txtsearch"]
(3)viewstate
(4)session


please help me out
Thanks for advance