First of all, this question is not clear. It will be better to get help from someone who can handle English in a better way.
Then, If you want to pass only
cuser_id and you want the value of this only in the destination page, better use
Query-String[
^].
obj5.Account_id = Session["aaa"].ToString();
obj5.Account_id = TextBox1.Text;
In the above code, remove the second line as it overwrites the
obj5.Account_id.
Regards
Sebastian