You can use
sessions
if the text contains some confidential data
otherwise you can send it in
querystring
.
using session
session["lbl"]=label1.text;
retrieving in 2nd page
string lbl=session["lbl"].tostring();
using Querystring
Response.redirect("secondpageurl.aspx?lbl="+label1.text,false);
you can retrieve as below
string lbl=request.querystring["lbl"].tostring();