if you mean session in asp.net :
session["namesession"]=Textbox1.text+Textbox2.text+Textbox3.text+TextBox4.text+dropdownlist.selectvalue+listbox.selectvalue;
namessesion is name you put for session name
you also can separated for each control example :
session["Text1"]=textbox1.text;
session["Text2"]=textbox2.text
for write session : example
response.write(session["namesession"]);
learning session in asp.net :
http://msdn.microsoft.com/en-us/library/87069683(v=VS.85).aspx
Article For C# in http://csharpme.blog.com